Information about branch added to the README

README.md

@@ -34,6 +34,8 @@ The installation follows the same steps needed usually to compile a ROS driver.
         $ roscd ardrone_autonomy
         ```
 
+** NOTE (For advanced users): ** Instead of the `master` branch you can use the `dev-unstable` branch for the latest _unstable_ code which may contain bug fixes or new features. This is the branch that all developments happen on. Please use this branch to submit pull requests.
+ 
 * Compile the AR-Drone SDK: The driver contains a slightly patched version of AR-Drone 2.0 SDK which is located in `ARDroneLib` directory. To compile it, execute the `./build_sdk.sh`. Any system-wide dependency will be managed by the SDK's build script. You may be asked to install some packages during the installation procedure (e.g `daemontools`). You can verify the success of the SDK's build by checking the `lib` folder.
 
         ```bash
@@ -225,6 +227,8 @@ comments for enhancements
 
 `github` offers a nice and convenient issue tracking and social coding platform, it can be used for bug reports and pull/feature request. This is the preferred method. You can also contact the author directly.
 
+If you want to submit a pull request, please submit to `dev-unstable` branch.
+
 ### Why the `ARDroneLib` has been patched?
 
 The ARDrone 2.0 SDK has been patched to 1) Enable the lib only build 2) Make its command parsing compatible with ROS and 3) To fix its weird `main()` function issue