Fix CONTRIBUTING.md references.

Closes #1040.

README.md

@@ -23,7 +23,7 @@ Second, read the [Troubleshooting Checklist](https://github.com/Homebrew/brew/bl
 **If you don't read these it will take us far longer to help you with your problem.**
 
 ## Contributing
-We'd love you to contribute to Homebrew. First, please read our [Contribution Guide](https://github.com/Homebrew/brew/blob/master/.github/CONTRIBUTING.md) and [Code of Conduct](https://github.com/Homebrew/brew/blob/master/CODEOFCONDUCT.md#code-of-conduct).
+We'd love you to contribute to Homebrew. First, please read our [Contribution Guide](https://github.com/Homebrew/brew/blob/master/CONTRIBUTING.md) and [Code of Conduct](https://github.com/Homebrew/brew/blob/master/CODEOFCONDUCT.md#code-of-conduct).
 
 We explicitly welcome contributions from people who have never contributed to open-source before: we were all beginners once! We can help build on a partially working pull request with the aim of getting it merged. We are also actively seeking to diversify our contributors and especially welcome contributions from women from all backgrounds and people of colour.
 

docs/FAQ.md

@@ -80,7 +80,7 @@ including how to set this across reboots. If you’re pre-Mountain Lion,
 alternative](https://developer.apple.com/legacy/library/qa/qa1067/_index.html).
 
 ### How do I contribute to Homebrew?
-Read [CONTRIBUTING.md](/.github/CONTRIBUTING.md).
+Read [CONTRIBUTING.md](/CONTRIBUTING.md).
 
 ### Why do you compile everything?
 Homebrew provides pre-compiled versions for many formulae. These

docs/Formula-Cookbook.md

@@ -34,7 +34,7 @@ Before submitting a new formula make sure your package:
 *   has a stable, tagged version (i.e. not just a GitHub repository with no versions). See [Interesting-Taps-&-Forks](Interesting-Taps-&-Forks.md) for where pre-release versions belong.
 *   passes all `brew audit --new-formula $FORMULA` tests.
 
-Before submitting a new formula make sure you read over our [contribution guidelines](https://github.com/Homebrew/brew/blob/master/.github/CONTRIBUTING.md).
+Before submitting a new formula make sure you read over our [contribution guidelines](https://github.com/Homebrew/brew/blob/master/CONTRIBUTING.md).
 
 ## Grab the URL
 

docs/README.md

@@ -21,7 +21,7 @@ However! Fixing build issues is easier than you think: try
 `brew edit $FORMULA` and see how you fare.
 
 ## Contributing
-Read [CONTRIBUTING.md](/.github/CONTRIBUTING.md).
+Read [CONTRIBUTING.md](/CONTRIBUTING.md).
 
 ### Community Forums
 -  [@MacHomebrew](https://twitter.com/MacHomebrew)