Set Travis-CI status image as link to build status

Author: techniq

README.rst

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 Flask-Script
 ==============
 
-.. image:: https://secure.travis-ci.org/techniq/flask-script.png
+.. image:: https://travis-ci.org/techniq/flask-script.png?branch=master
+        :target: https://travis-ci.org/techniq/flask-script
 
 A set of utilities for use with the Flask framework, which provide
 decorators, classes and helpers for writing your own script commands.