docs(README.md): added urls for badges (travis, rtd, etc...)

README.md

@@ -1,5 +1,12 @@
 # click-params
 
+[![Pypi version](https://img.shields.io/pypi/v/click_params.svg)](https://pypi.org/project/click_params/)
+[![Build Status](https://travis-ci.com/lewoudar/click_params.svg?branch=master)](https://travis-ci.com/lewoudar/click_params)
+[![Windows Build Status](https://img.shields.io/appveyor/ci/lewoudar/click-params/master.svg?label=Windows)](https://ci.appveyor.com/project/lewoudar/click-params)
+[![Coverage Status](https://codecov.io/gh/lewoudar/click_params/branch/master/graphs/badge.svg?branch=master)](https://codecov.io/gh/lewoudar/click_params)
+[![Documentation Status](https://readthedocs.org/projects/click_params/badge/?version=latest)](https://click-params.readthedocs.io/en/latest/?badge=latest)
+[![License Apache 2](https://img.shields.io/hexpm/l/plug.svg)](http://www.apache.org/licenses/LICENSE-2.0)
+
 A bunch of useful click parameter types.
 
 ## Why?