update contributors

CONTRIBUTING.md

@@ -11,6 +11,14 @@ Please only modify `js/jquery.terminal-src.js`/`css/jquery.terminal-src.css` fil
 Non tech contribution are also welcome, if you find a bug in documentation on the website you can file an issue to [jcubic/jquery.terminal-www](https://github.com/jcubic/jquery.terminal-www).
 
 
+## List of contributors with avatars
+
+To update the list, the script need to be run when change is merged to master and since all merges are done on
+devel. I need to run the script when I'm releasing new version. To help me remember, if this is yours first
+contribution, please modify template/Makefile.in and update line `UPDATE_CONTRIBUTORS=1` it should be 1 which
+is true (0 is false). On each build it will show red reminder message and it will stop build when run on master.
+
+
 ## Test
 
 You should run test to make sure you don't break anything, to run tests from browser you need to run