Merge pull request #53 from psobot/psobot/13.1

Add Keynote 13.1 support.

Update __init__.py

Bump version.

Bump version.

Merge pull request #40 from psobot/psobot/keynote-12-1

Add support for Keynote 12.1.

Update __init__.py

Add compatibility note to Readme.

Upgrade to Keynote 11.2. Closes #33.

Merge pull request #31 from psobot/psobot/fix-version-warning

Fix Keynote version warning in Py3.6.

Merge pull request #30 from psobot/psobot/update-to-keynote-10.2

Add support for Keynote 10.2.