Update pubspec.yaml (#3500)

add topics to the pubspec

Author: devoncarew

scratch_space/CHANGELOG.md

@@ -1,6 +1,7 @@
-## 1.0.2-dev
+## 1.0.2
 
-- Require Dart >=2.18.0
+- Added package topics to the pubspec file.
+- Require Dart >=2.18.0.
 
 ## 1.0.1
 

scratch_space/pubspec.yaml

@@ -1,8 +1,12 @@
 name: scratch_space
-version: 1.0.2-dev
-description: A tool to manage running external executables within package:build
+version: 1.0.2
+description: A tool to manage running external executables within package:build.
 repository: https://github.com/dart-lang/build/tree/master/scratch_space
 
+topics:
+  - build-runner
+  - codegen
+
 environment:
   sdk: ">=2.19.0 <3.0.0"