Update installation.md

Author: bholloway

getting-started/installation.md

@@ -52,12 +52,18 @@ Perform a global installation using npm.
 
     npm install -g angularity
 
-### Pre-release
+### or Pre-release
 
 You can install from github. However this is considered bleeding edge.
 
     npm install -g angularity/node-angularity
 
+### Check installation
+
+Run the angularity version command to make sure the installation worked.
+
+    angularity -v
+
 ## [optional] Angularity Source Code
 
 If you wish to develop or contribute to the Angularity project you will need to [fork the project]([https://github.com/angularity/node-angularity/fork](https://github.com/angularity/node-angularity/fork) on github.