Typo: Contibuting => Contributing

Author: ederag

README.rst

@@ -46,8 +46,8 @@ To see all the possible configuration options read the configuring docs
 `here <https://sphinx-rtd-theme.readthedocs.io/en/latest/configuring.html>`__.
 
 
-Contibuting
-===========
+Contributing
+============
 
 If you would like to help improve the theme or have more control
 over the theme in case of a fork please read our contributing guide