diff --git a/Cargo.lock b/Cargo.lock
index eb10968..6493d8b 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -31,15 +31,15 @@ dependencies = [
 
 [[package]]
 name = "assert_cli"
-version = "0.5.4"
+version = "0.6.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "colored 1.6.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "difference 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "difference 2.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "environment 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "error-chain 0.11.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "failure 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "failure_derive 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde_json 1.0.22 (registry+https://github.com/rust-lang/crates.io-index)",
- "skeptic 0.13.3 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -73,21 +73,11 @@ dependencies = [
  "libc 0.2.42 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
-[[package]]
-name = "bitflags"
-version = "0.9.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-
 [[package]]
 name = "bitflags"
 version = "1.0.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
-[[package]]
-name = "bytecount"
-version = "0.3.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-
 [[package]]
 name = "byteorder"
 version = "0.5.3"
@@ -131,18 +121,6 @@ dependencies = [
  "cc 1.0.17 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
-[[package]]
-name = "cargo_metadata"
-version = "0.5.6"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "error-chain 0.11.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "semver 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde 1.0.68 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde_derive 1.0.68 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde_json 1.0.22 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
 [[package]]
 name = "cc"
 version = "1.0.17"
@@ -186,7 +164,7 @@ dependencies = [
 
 [[package]]
 name = "difference"
-version = "1.0.0"
+version = "2.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
@@ -209,18 +187,29 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "error-chain"
-version = "0.11.0"
+version = "0.12.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "backtrace 0.3.9 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
-name = "error-chain"
-version = "0.12.0"
+name = "failure"
+version = "0.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "backtrace 0.3.9 (registry+https://github.com/rust-lang/crates.io-index)",
+ "failure_derive 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "failure_derive"
+version = "0.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "quote 0.3.15 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 0.11.11 (registry+https://github.com/rust-lang/crates.io-index)",
+ "synstructure 0.6.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -233,20 +222,6 @@ name = "fixedbitset"
 version = "0.1.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
-[[package]]
-name = "fuchsia-zircon"
-version = "0.3.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "bitflags 1.0.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "fuchsia-zircon-sys 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
-[[package]]
-name = "fuchsia-zircon-sys"
-version = "0.3.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-
 [[package]]
 name = "gimli"
 version = "0.15.0"
@@ -371,14 +346,6 @@ dependencies = [
  "unicode-xid 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
-[[package]]
-name = "pulldown-cmark"
-version = "0.1.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "bitflags 0.9.1 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
 [[package]]
 name = "quote"
 version = "0.3.15"
@@ -392,16 +359,6 @@ dependencies = [
  "proc-macro2 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
-[[package]]
-name = "rand"
-version = "0.4.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "fuchsia-zircon 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.42 (registry+https://github.com/rust-lang/crates.io-index)",
- "winapi 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
 [[package]]
 name = "redox_syscall"
 version = "0.1.40"
@@ -415,14 +372,6 @@ dependencies = [
  "redox_syscall 0.1.40 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
-[[package]]
-name = "remove_dir_all"
-version = "0.5.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "winapi 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
 [[package]]
 name = "rustc-demangle"
 version = "0.1.8"
@@ -432,7 +381,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 name = "rustig"
 version = "0.2.0"
 dependencies = [
- "assert_cli 0.5.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "assert_cli 0.6.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "callgraph 0.1.0",
  "clap 2.32.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "error-chain 0.12.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -444,14 +393,6 @@ dependencies = [
  "toml 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
-[[package]]
-name = "same-file"
-version = "1.0.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "winapi 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
 [[package]]
 name = "scroll"
 version = "0.8.0"
@@ -469,20 +410,6 @@ dependencies = [
  "syn 0.11.11 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
-[[package]]
-name = "semver"
-version = "0.9.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "semver-parser 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde 1.0.68 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
-[[package]]
-name = "semver-parser"
-version = "0.7.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-
 [[package]]
 name = "serde"
 version = "1.0.68"
@@ -508,21 +435,6 @@ dependencies = [
  "serde 1.0.68 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
-[[package]]
-name = "skeptic"
-version = "0.13.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "bytecount 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "cargo_metadata 0.5.6 (registry+https://github.com/rust-lang/crates.io-index)",
- "error-chain 0.11.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "glob 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)",
- "pulldown-cmark 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde_json 1.0.22 (registry+https://github.com/rust-lang/crates.io-index)",
- "tempdir 0.3.7 (registry+https://github.com/rust-lang/crates.io-index)",
- "walkdir 2.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
 [[package]]
 name = "smallvec"
 version = "0.4.4"
@@ -567,12 +479,12 @@ dependencies = [
 ]
 
 [[package]]
-name = "tempdir"
-version = "0.3.7"
+name = "synstructure"
+version = "0.6.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "rand 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "remove_dir_all 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "quote 0.3.15 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 0.11.11 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -631,15 +543,6 @@ name = "vec_map"
 version = "0.8.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
-[[package]]
-name = "walkdir"
-version = "2.1.4"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "same-file 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "winapi 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
 [[package]]
 name = "winapi"
 version = "0.3.5"
@@ -663,33 +566,29 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 "checksum addr2line 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)" = "cb0edd8d04635ee7996ad7daaf173d392f5b737ef9cf315ee79beffa05689cfb"
 "checksum ansi_term 0.11.0 (registry+https://github.com/rust-lang/crates.io-index)" = "ee49baf6cb617b853aa8d93bf420db2383fab46d314482ca2803b40d5fde979b"
 "checksum arrayvec 0.4.7 (registry+https://github.com/rust-lang/crates.io-index)" = "a1e964f9e24d588183fcb43503abda40d288c8657dfc27311516ce2f05675aef"
-"checksum assert_cli 0.5.4 (registry+https://github.com/rust-lang/crates.io-index)" = "72342c21057a3cb5f7c2d849bf7999a83795434dd36d74fa8c24680581bd1930"
+"checksum assert_cli 0.6.3 (registry+https://github.com/rust-lang/crates.io-index)" = "a29ab7c0ed62970beb0534d637a8688842506d0ff9157de83286dacd065c8149"
 "checksum atty 0.2.10 (registry+https://github.com/rust-lang/crates.io-index)" = "2fc4a1aa4c24c0718a250f0681885c1af91419d242f29eb8f2ab28502d80dbd1"
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@@ -706,30 +605,23 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
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-"checksum skeptic 0.13.3 (registry+https://github.com/rust-lang/crates.io-index)" = "c4474d6da9593171bcb086890fc344a3a12783cb24e5b141f8a5d0e43561f4b6"
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 "checksum smallvec 0.6.2 (registry+https://github.com/rust-lang/crates.io-index)" = "312a7df010092e73d6bbaf141957e868d4f30efd2bfd9bb1028ad91abec58514"
 "checksum strsim 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)" = "bb4f380125926a99e52bc279241539c018323fab05ad6368b56f93d9369ff550"
 "checksum syn 0.11.11 (registry+https://github.com/rust-lang/crates.io-index)" = "d3b891b9015c88c576343b9b3e41c2c11a51c219ef067b264bd9c8aa9b441dad"
 "checksum syn 0.14.2 (registry+https://github.com/rust-lang/crates.io-index)" = "c67da57e61ebc7b7b6fff56bb34440ca3a83db037320b0507af4c10368deda7d"
 "checksum synom 0.11.3 (registry+https://github.com/rust-lang/crates.io-index)" = "a393066ed9010ebaed60b9eafa373d4b1baac186dd7e008555b0f702b51945b6"
-"checksum tempdir 0.3.7 (registry+https://github.com/rust-lang/crates.io-index)" = "15f2b5fb00ccdf689e0149d1b1b3c03fead81c2b37735d812fa8bddbbf41b6d8"
+"checksum synstructure 0.6.1 (registry+https://github.com/rust-lang/crates.io-index)" = "3a761d12e6d8dcb4dcf952a7a89b475e3a9d69e4a69307e01a470977642914bd"
 "checksum termion 1.5.1 (registry+https://github.com/rust-lang/crates.io-index)" = "689a3bdfaab439fd92bc87df5c4c78417d3cbe537487274e9b0b2dce76e92096"
 "checksum textwrap 0.10.0 (registry+https://github.com/rust-lang/crates.io-index)" = "307686869c93e71f94da64286f9a9524c0f308a9e1c87a583de8e9c9039ad3f6"
 "checksum toml 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)" = "a0263c6c02c4db6c8f7681f9fd35e90de799ebd4cfdeab77a38f4ff6b3d8c0d9"
@@ -737,7 +629,6 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 "checksum unicode-xid 0.0.4 (registry+https://github.com/rust-lang/crates.io-index)" = "8c1f860d7d29cf02cb2f3f359fd35991af3d30bac52c57d265a3c461074cb4dc"
 "checksum unicode-xid 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "fc72304796d0818e357ead4e000d19c9c174ab23dc11093ac919054d20a6a7fc"
 "checksum vec_map 0.8.1 (registry+https://github.com/rust-lang/crates.io-index)" = "05c78687fb1a80548ae3250346c3db86a80a7cdd77bda190189f2d0a0987c81a"
-"checksum walkdir 2.1.4 (registry+https://github.com/rust-lang/crates.io-index)" = "63636bd0eb3d00ccb8b9036381b526efac53caf112b7783b730ab3f8e44da369"
 "checksum winapi 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)" = "773ef9dcc5f24b7d850d0ff101e542ff24c3b090a9768e03ff889fdef41f00fd"
 "checksum winapi-i686-pc-windows-gnu 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)" = "ac3b87c63620426dd9b991e5ce0329eff545bccbbb34f3be09ff6fb6ab51b7b6"
 "checksum winapi-x86_64-pc-windows-gnu 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)" = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f"
diff --git a/Cargo.toml b/Cargo.toml
index 6e0eeb0..fc562b6 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -33,5 +33,5 @@ error-chain = "0.12.0"
 serde_json = "1.0.22"
 
 [dev-dependencies]
-assert_cli = "0.5"
+assert_cli = "0.6"
 test_common = { path = "lib/test_common", version = "0.1.0" }