update README

Author: Lasha Gogua

README.rst

@@ -56,8 +56,9 @@ The source code can be found on github_.
 
 Contributing
 -----------------
-There are plenty of ways to contribute to this project. If you think you’ve found a bug please submit an issue.
+There are plenty of ways to contribute to this project. If you think you’ve found a bug please submit an issue_.
 
 
 .. _examples: https://github.com/Lh4cKg/simple-geolang-toolkit/blob/master/example.py
-.. _github: https://github.com/Lh4cKg/simple-geolang-toolkit
+.. _github: https://github.com/Lh4cKg/simple-geolang-toolkit
+.. _issue: https://github.com/Lh4cKg/simple-geolang-toolkit/issues