Fix perltidyrc path error on CONTRIBUTING.md

Author: yoshikazusawa

CONTRIBUTING.md

@@ -37,7 +37,7 @@ You can run tests directly using the `prove` tool:
 
 ## Code style and tidying
 
-This distribution contains a `.perltidyrc` file in the root of the repository.
+This distribution contains a `perltidyrc` file in the root of the repository.
 Please install Perl::Tidy and use `perltidy` before submitting patches. However,
 as this is an old distribution and styling has changed somewhat over the years,
 please keep your tidying constrained to the portion of code or function in which
@@ -48,7 +48,7 @@ you're patching.
     $ rm my_tidy_copy.pm
 
 The above command, for example, would provide you with a copy of `Status.pm`
-that has been cleaned according to our `.perltidyrc` settings. You'd then look
+that has been cleaned according to our `perltidyrc` settings. You'd then look
 at the newly created `my_tidy_copy.pm` in the dist root and replace your work
 with the cleaned up copy if there are differences.