CONTRIBUTING.md in fake_braintree-0.6.0 vs CONTRIBUTING.md in fake_braintree-0.7.0

@@ -1,7 +1,12 @@
-We love pull requests. Here's a quick guide:
+We love pull requests. We expect users to follow our
+[code of conduct] while submitting code or comments.
 
+[code of conduct]: https://thoughtbot.com/open-source-code-of-conduct
+
+Here's a quick guide:
+
 1. Fork the repo.
 
 2. Run the tests. We only take pull requests with passing tests, and it's great
 to know that you have a clean slate: `bundle && rake`
 
@@ -10,10 +15,9 @@
 a test!
 
 4. Make the test pass.
 
 5. Push to your fork and submit a pull request.
-
 
 At this point you're waiting on us. We like to at least comment on, if not
 accept, pull requests within three business days (and, typically, one business
 day). We may suggest some changes or improvements or alternatives.