Update CONTRIBUTING.md

.github/CONTRIBUTING.md

@@ -1,6 +1,6 @@
-# Haywire Grav Contributing Guide
+# Contributing
 
-Thank you for taking an interest in Haywire theme for Grav CMS, please follow the instructions below when contributing to the theme.
+Thank you for taking an interest in contributing to `haywire-grav`. All contributions will be fully credited.
 
 ## Bug Reporting
 
@@ -16,12 +16,18 @@ Create an issue using the [Feature Request Template.](https://github.com/robbinf
 
 - Checkout a topic branch from the relevant branch, e.g. `develop`, and merge back against that branch.
 
+- **Document any change in behaviour:** Make sure the `README.md`, `CHANGELOG.md` and any other relevant documentation are kept up-to-date.
+
+- **One pull request per feature:** If you want to do more than one thing, send multiple pull requests.
+
 ## Development
 
-```shell
+``` shell
 # @ path/to/grav/installation
 $ cd user/themes/
 $ git clone https://github.com/robbinfellow/haywire-grav.git haywire
 $ cd haywire && yarn
 $ yarn dev / watch / production
 ```
+
+**Happy coding**!