CONTRIBUTING.md in platform-api-0.8.0 vs CONTRIBUTING.md in platform-api-1.0.0

- old
+ new

@@ -9,9 +9,11 @@
   * Review open [issues](https://github.com/heroku/platform/issues) for things to help on.
   * [Create an issue](https://github.com/heroku/platform/issues/new) to start a discussion on additions or features.
 * Fork the project, add your changes and tests to cover them in a topic branch.
 * Commit your changes and rebase against `heroku/platform` to ensure everything is up to date.
 * [Submit a pull request](https://github.com/heroku/platform/compare/).
+* This project follows [semver](http://semver.org) from version 1.0.0. Please
+  be sure to keep this in mind if you're the project maintainer.
 
 ### Non-Coding
 
 * Offer feedback on open [issues](https://github.com/heroku/platform/issues).
 * Organize or volunteer at events.