[EN-1528] pypi badge

Author: iamishalkin

README.md

@@ -1,6 +1,6 @@
 # dxfeed package
 
-![PyPI](https://img.shields.io/pypi/v/dxfeed)
+[![PyPI](https://img.shields.io/pypi/v/dxfeed)](https://pypi.org/project/dxfeed/)
 [![Documentation Status](https://readthedocs.org/projects/dxfeed/badge/?version=latest)](https://dxfeed.readthedocs.io/en/latest/?badge=latest)
 
 This package provides access to [dxFeed](https://www.dxfeed.com/) streaming data.