PoisonApple v0.2.3

Formatted code using black, bump license for 2022, and misc edits.

PoisonApple v0.2.2

Added iTerm2 persistence technique.

PoisonApple v0.2.1

Re-arrange techniques and improve code base by using subclasses.

PoisonApple v0.2.0

Initial public release with 16 techniques.