removed PyPI package badge; updated Licence badge

README.md

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-[//]: # ( [![PyPI package](https://img.shields.io/pypi/v/datanator.svg)](https://pypi.python.org/pypi/datanator) )
 [![Documentation](https://readthedocs.org/projects/datanator/badge/?version=latest)](http://docs.karrlab.org/datanator)
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 # Datanator: Toolkit for discovering and aggregating data for whole-cell modeling