Added advice to add make test to the pre-commit git hook.

README.rst

@@ -62,7 +62,8 @@ To resign **ALL** existing keys (regardles of existing certificates) ::
 Development
 -----------
 
-For easing devlopment ``make test`` and ``make clean`` are also provided.
+For easing devlopment ``make test`` and ``make clean`` are also provided (it's
+recommended to add ``make test`` to the pre-commit git hook).
 
 License
 -------