[PyMOL] Python 2 support removed from master branch

[Thomas H. <tho...@sc...>]

To those who compile Open-Source PyMOL from the github repo:

We've removed Python 2 support from the master branch, the master branch now requires Python 3.6 or later.

There is a new "py2" branch which marks the last Python 2 compatible state. We have no plans to actively maintain this legacy branch, but we will accept pull requests with bug fixes.

Cheers,
  Thomas

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Thomas Holder
PyMOL Principal Developer
Schrödinger, Inc.