DOC more badges in README

Author: kmike

README.rst

@@ -1,11 +1,21 @@
 Webstruct
 =========
 
+.. image:: https://img.shields.io/pypi/v/webstruct.svg
+   :target: https://pypi.python.org/pypi/webstruct
+   :alt: PyPI Version
+
 .. image:: https://travis-ci.org/scrapinghub/webstruct.svg?branch=master
    :target: https://travis-ci.org/scrapinghub/webstruct
+   :alt: Build Status
 
 .. image:: https://codecov.io/gh/scrapinghub/webstruct/branch/master/graph/badge.svg
    :target: https://codecov.io/gh/scrapinghub/webstruct
+   :alt: Code Coverage
+
+.. image:: https://readthedocs.org/projects/webstruct/badge/?version=latest
+   :target: http://webstruct.readthedocs.io/en/latest/
+   :alt: Documentation
 
 
 Webstruct is a library for creating statistical NER_ systems that work
@@ -20,7 +30,7 @@ Read the docs_ for more info.
 
 License is MIT.
 
-.. _docs: http://webstruct.readthedocs.org/en/latest/
+.. _docs: http://webstruct.readthedocs.io/en/latest/
 .. _NER: http://en.wikipedia.org/wiki/Named-entity_recognition
 
 Contributing