Merge pull request #327 from rbasso/nth-prime-fix-comment-to-match-x-common

nth-prime: Fix comment to say that is matches x-common.

Author: rbasso

exercises/nth-prime/test/Tests.hs

@@ -19,9 +19,7 @@ specs = describe "nth-prime" $
       where
         assertion = nth (fromIntegral input) `shouldBe` expected
 
--- As of 2016-09-06, there was no reference file for the test cases in
--- `exercism/x-common`, so we adapted the test cases available in the
--- pull request `exercism/x-common#332`.
+-- Test cases adapted from `exercism/x-common` on 2016-09-19.
 
 data Case = Case { description :: String
                  , input       :: Integer