Point links in contribution guide at Tigerbrew

These links went to the upstream Homebrew project, and some of them are no longer at that URL. This updates them to point at this project’s copy.

CONTRIBUTING.md

@@ -2,7 +2,7 @@
 ## Reporting Bugs
 First, please run `brew update` and `brew doctor`.
 
-Second, read the [Troubleshooting Checklist](https://github.com/Homebrew/homebrew/blob/master/share/doc/homebrew/Troubleshooting.md#troubleshooting).
+Second, read the [Troubleshooting Checklist](https://github.com/mistydemeo/tigerbrew/blob/master/share/doc/homebrew/Troubleshooting.md#troubleshooting).
 
 **If you don't read these it will take us far longer to help you with your problem.**
 
@@ -12,11 +12,11 @@ Please report security issues to [email protected].
 ## Contributing
 Please read:
 
-* [Code of Conduct](https://github.com/Homebrew/homebrew/blob/master/CODEOFCONDUCT.md#code-of-conduct)
-* [Formula Cookbook](https://github.com/Homebrew/homebrew/blob/master/share/doc/homebrew/Formula-Cookbook.md#formula-cookbook)
-* [Acceptable Formulae](https://github.com/Homebrew/homebrew/blob/master/share/doc/homebrew/Acceptable-Formulae.md#acceptable-formulae)
+* [Code of Conduct](https://github.com/mistydemeo/tigerbrew/blob/master/CODEOFCONDUCT.md#code-of-conduct)
+* [Formula Cookbook](https://github.com/mistydemeo/tigerbrew/blob/master/share/doc/homebrew/Formula-Cookbook.md)
+* [Acceptable Formulae](https://github.com/mistydemeo/tigerbrew/blob/master/share/doc/homebrew/Acceptable-Formulae.md#acceptable-formulae)
 * [Ruby Style Guide](https://github.com/styleguide/ruby)
-* [How To Open a Homebrew Pull Request (and get it merged)](https://github.com/Homebrew/homebrew/blob/master/share/doc/homebrew/How-To-Open-a-Homebrew-Pull-Request-(and-get-it-merged).md#how-to-open-a-homebrew-pull-request-and-get-it-merged)
+* [How To Open a Tigerbrew Pull Request (and get it merged)](https://github.com/mistydemeo/tigerbrew/blob/master/share/doc/homebrew/How-To-Open-a-Homebrew-Pull-Request-(and-get-it-merged).md#how-to-open-a-tigerbrew-pull-request-and-get-it-merged)
 
 Tigerbrew guidelines
 --------------------