Adds more README badges

Author: ask

README.rst

@@ -2,9 +2,31 @@
 billiard
 ========
 :version: 3.5.0.0
-.. image:: https://travis-ci.org/celery/billiard.svg?branch=master
+
+|build-status| |coverage| |license| |wheel| |pyversion| |pyimp|
+
+.. |build-status| image:: https://secure.travis-ci.org/celery/billiard.png?branch=master
+    :alt: Build status
     :target: https://travis-ci.org/celery/billiard
-    :alt: Travis-CI Status
+
+.. |coverage| image:: https://codecov.io/github/celery/billiard.svg?branch=master
+    :target: https://codecov.io/github/celery/billiard?branch=master
+
+.. |license| image:: https://img.shields.io/pypi/l/billiard.svg
+    :alt: BSD License
+    :target: https://opensource.org/licenses/BSD-3-Clause
+
+.. |wheel| image:: https://img.shields.io/pypi/wheel/billiard.svg
+    :alt: Billiard can be installed via wheel
+    :target: http://pypi.python.org/pypi/billiard
+
+.. |pyversion| image:: https://img.shields.io/pypi/pyversions/billiard.svg
+    :alt: Supported Python versions.
+    :target: http://pypi.python.org/pypi/billiard
+
+.. |pyimp| image:: https://img.shields.io/pypi/implementation/billiard.svg
+    :alt: Support Python implementations.
+    :target: http://pypi.python.org/pypi/billiard
 
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