update readme

Author: jonian

README.md

@@ -4,15 +4,20 @@
 
 ![DevDocs Desktop](https://github.com/hardpixel/devdocs-desktop/raw/master/screenshot.png)
 
-## Command Line Usage
-
+## Command Line
 To launch the application from the terminal use `devdocs-desktop [STRING]`.
 If a string is provided, the application will open the first available result page.
 
 ## Requirements
-
-    python, python-gobject, webkit2gtk
+```
+python, python-gobject, webkit2gtk
+```
 
 ## Installation
-
 Arch Linux: [AUR Package](https://aur.archlinux.org/packages/devdocs-desktop)
+
+## Contributing
+Bug reports and pull requests are welcome on GitHub at https://github.com/hardpixel/devdocs-desktop.
+
+## License
+Unite Shell is available as open source under the terms of the [GPLv3](http://www.gnu.org/licenses/gpl-3.0.en.html)