Add marshmallow 3 badge
@@ -8,6 +8,10 @@ webargs
.. image:: https://travis-ci.org/sloria/webargs.svg?branch=pypi
:target: https://travis-ci.org/sloria/webargs
+.. image:: https://img.shields.io/badge/marshmallow-3-blue.svg
+ :target: https://marshmallow.readthedocs.io/en/latest/upgrading.html
+ :alt: marshmallow 3 compatible
+
Homepage: https://webargs.readthedocs.io/
webargs is a Python library for parsing and validating HTTP request arguments, with built-in support for popular web frameworks, including Flask, Django, Bottle, Tornado, Pyramid, webapp2, Falcon, and aiohttp.
