add newlines

cabal-testsuite/PackageTests/NewBuild/CmdRun/WarningRTS/Main.hs

-main = putStrLn "Hello World"
\ No newline at end of file
+main = putStrLn "Hello World"

cabal-testsuite/PackageTests/NewBuild/CmdRun/WarningRTS/cabal.test.hs

@@ -9,4 +9,4 @@ main = cabalTest $ do
     assertOutputContains       "Warning" res
 
     res <- cabal' "run" [ "--", "+RTS"]
-    assertOutputDoesNotContain "Warning" res
\ No newline at end of file
+    assertOutputDoesNotContain "Warning" res