Merge pull request #184 from exercism/rpottsoh-patch-1

fix broken link to installation instructions

Author: rpottsoh

docs/EXERCISE_README_INSERT.md

@@ -1,7 +1,7 @@
 ## Testing
 
 In order to run the tests for this track, you will need to install
-DUnitX. Please see the [installation](http://www.exercism.io/languages/delphi/installing) instructions for more information.
+DUnitX. Please see the [installation](http://www.exercism.io/languages/delphi/installation) instructions for more information.
 
 ### Loading Exercises into Delphi