Move license to a badge

Also remove documentation link since it's already available as a badge
and minor changes to the other badges

README.rst

@@ -2,32 +2,33 @@
 Rabbit Hole
 ===============================
 
+.. image:: https://img.shields.io/badge/License-MIT-blue.svg
+    :target: https://opensource.org/licenses/MIT
+    :alt: License
 
 .. image:: https://img.shields.io/pypi/v/rabbithole.svg
-        :target: https://pypi.python.org/pypi/rabbithole
+    :target: https://pypi.python.org/pypi/rabbithole
+    :alt: PyPI version
 
 .. image:: https://img.shields.io/travis/jcollado/rabbithole.svg
-        :target: https://travis-ci.org/jcollado/rabbithole
+    :target: https://travis-ci.org/jcollado/rabbithole
+    :alt: Continuous integration
 
 .. image:: https://coveralls.io/repos/github/jcollado/rabbithole/badge.svg?branch=master
-		:target: https://coveralls.io/github/jcollado/rabbithole?branch=master
+    :target: https://coveralls.io/github/jcollado/rabbithole?branch=master
+    :alt: Coverage
 
 .. image:: https://readthedocs.org/projects/rabbitmqhole/badge/?version=latest
-        :target: https://rabbitmqhole.readthedocs.io/en/latest/?badge=latest
-        :alt: Documentation Status
+    :target: https://rabbitmqhole.readthedocs.io/en/latest/?badge=latest
+    :alt: Documentation Status
 
 .. image:: https://pyup.io/repos/github/jcollado/rabbithole/shield.svg
-     :target: https://pyup.io/repos/github/jcollado/rabbithole/
-     :alt: Updates
+    :target: https://pyup.io/repos/github/jcollado/rabbithole/
+    :alt: Updates
 
 
 Store messages from rabbitmq into a SQL database
 
-
-* Free software: MIT license
-* Documentation: https://rabbitmqhole.readthedocs.io.
-
-
 Features
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