pull request guide added

Author: needim

README.markdown

@@ -43,8 +43,8 @@ Documentation and examples are here: <http://needim.github.io/noty>
 2. If you cloned a while ago, get the latest changes from upstream:
 
    ```bash
-   git checkout master
-   git pull upstream master
+   git checkout develop
+   git pull upstream develop
    ```
 
 3. Create a new topic branch (off the main project development branch) to
@@ -63,7 +63,7 @@ Documentation and examples are here: <http://needim.github.io/noty>
 5. Locally merge (or rebase) the upstream development branch into your topic branch:
 
    ```bash
-   git pull [--rebase] upstream master
+   git pull [--rebase] upstream develop
    ```
 
 6. Push your topic branch up to your fork: