Fix homebrew contributing link

Author: SeanTAllen

RELEASE_PROCESS.md

@@ -155,7 +155,7 @@ Make sure you do your changes on a branch:
 
 * git checkout -b ponyc-0.3.1
 
-HomeBrew has [directions](https://github.com/Homebrew/homebrew-core/blob/master/.github/CONTRIBUTING.md#submit-a-123-version-upgrade-for-the-foo-formula) on what specifically you need to update in a formula to account for an upgrade. If you are on OSX and are unsure of how to get the SHA of the release .tar.gz, download the release file (make sure it does unzip it) and run `shasum -a 256 ponyc-0.3.1.tar.gz`. If you are on OSX, its quite possible it will try to unzip the file on your. In Safari, right clicking and selecting "Download Linked File" will get your the complete .tar.gz.
+HomeBrew has [directions](https://github.com/Homebrew/homebrew-core/blob/master/CONTRIBUTING.md#submit-a-123-version-upgrade-for-the-foo-formula) on what specifically you need to update in a formula to account for an upgrade. If you are on OSX and are unsure of how to get the SHA of the release .tar.gz, download the release file (make sure it does unzip it) and run `shasum -a 256 ponyc-0.3.1.tar.gz`. If you are on OSX, its quite possible it will try to unzip the file on your. In Safari, right clicking and selecting "Download Linked File" will get your the complete .tar.gz.
 
 After updating the ponyc formula, push to your fork and open a PR against homebrew-core. According to the homebrew team, their preferred naming for such PRs is `ponyc 0.3.1` that is, the name of the formula being updated followed by the new version number.