Bump version number to 3.0.0 for PyCharm plugin.
Bump version number to 3.0.0 for PyCharm plugin.

donkirkby/live-py-plugin,brandm/live-py-plugin,brandm/live-py-plugin,donkirkby/live-py-plugin,donkirkby/live-py-plugin,donkirkby/live-py-plugin,brandm/live-py-plugin,brandm/live-py-plugin,donkirkby/live-py-plugin,brandm/live-py-plugin