Added develop to be used for contributions

Author: knoxfighter

README.md

@@ -29,11 +29,12 @@ This tool runs on a Factorio server and allows management of the Factorio server
 
 ## Contributing
 1. Fork it!
+2. Checkout the develop branch, only use that as a base: `git checkout develop`
 2. Create your feature branch: `git checkout -b my-new-feature`
 3. Commit your changes: `git commit -am 'Add some feature'`
 4. Add your changes a in human readable way into CHANGELOG.md
 4. Push to the branch: `git push origin my-new-feature`
-5. Submit a pull request :D
+5. Submit a pull request, with `develop` as base :D
 
 ## Authors