Tweaked CONTRIBUTING.md text

CONTRIBUTNG.md

@@ -4,22 +4,20 @@ Contributions are **welcome** and will be fully **credited**.
 
 We accept contributions via Pull Requests on [Github](https://github.com/thephpleague/tactician).
 
-
 ## Pull Requests
 
 - **[PSR-2 Coding Standard](https://github.com/php-fig/fig-standards/blob/master/accepted/PSR-2-coding-style-guide.md)** - The easiest way to apply the conventions is to install [PHP Code Sniffer](http://pear.php.net/package/PHP_CodeSniffer).
 
-- **Add tests!** - to ensure a high quality code base your code patch can't be accepted if it doesn't have tests.
+- **Add tests!** - to ensure a high quality code base, your code patch can't be accepted if it doesn't have tests.
 
-- **Document any change in behaviour** - Make sure the `README.md` and any other relevant documentation are kept up-to-date.
+- **Document any change in behaviour** - Make sure the `CHANGELOG.md`, `README.md` and any other relevant documentation are kept up-to-date.
 
 - **Consider our release cycle** - Since we're using semantic versioning ([SemVer v2.0.0](http://semver.org/)). Changes to the API must be done with great consideration, and prevented if at all possible.
 
 - **Create feature branches** - Master is the stable branch, create a new branch for each feature.
 
 - **One pull request per feature** - If you want to do more than one thing, send multiple pull requests.
 
-- **Send coherent history** - Make sure each individual commit in your pull request is meaningful. If you had to make multiple intermediate commits while developing, please squash them before submitting.
-
+- **Be respectful** - Be excellent to other contributors.
 
 **Happy coding**!