add rules for write access

README.md

@@ -362,7 +362,7 @@ just add the line
 to your `_plugins/ext.rb` before requiring 'jekyll/scholar', where
 `/full/path/to/the/repository` is where you have cloned jekyll-scholar into.
 
-If you want to contribute to jekyll-scholar, please make sure to install
+When contributing to jekyll-scholar, please make sure to install
 all dependencies and run the cucumber features:
 
     $ bundle install
@@ -373,6 +373,9 @@ If you've found a bug or have a question, please open an issue on the
 Or, for extra credit, clone the Jekyll-Scholar repository, write a failing
 example, fix the bug and submit a pull request.
 
+Additionally, if we merged at least one of your pull request you will get
+write permissions to the repository if you want them.
+
 License
 -------