Show what dos2unix changed

Author: phansch

.travis.yml

@@ -44,6 +44,8 @@ install:
         cat -e tests/ui/builtin-type-shadow.stderr
         dos2unix tests/ui/**/*.stderr
         dos2unix tests/ui/**/*.rs
+        cat -e tests/ui/builtin-type-shadow.rs
+        cat -e tests/ui/builtin-type-shadow.stderr
       fi
     fi