python 3

• This is a python 3 only version, dropping support for Python 2 ahead of January 2020.
• Several bug fixes

0.7.0

• added cyrest module
• https://py2cytoscape.readthedocs.io now online

0.6.2

put python-igraph back to install_requires

0.6.1

Moved python-igraph and scipy to the optional dependencies.