Version 2.2.0: Faster Statcast, more Statcast, and eliminate dependencies

What's new:

• We removed some fairly unnecessary dependencies that were causing a massive amount of dependency bloat -- @TheCleric and @bdilday.

• Cleaning up and parallelizing Statcast calls -- @TheCleric, @bdilday, and @schorrm

• Statcast spin rate & spin direction -- @tpoatsy3, see docs/statcast_pitcher_spin.md for more info.

• Statcast Batter & Pitcher leaderboards -- @wfordh

• Various test fixes -- @TheCleric

• Spell-check to playerid lookup -- @tjburch and @mwisnie5

• Plotting bugfix -- @andersonfrailey

• Marcels Example -- @andersonfrailey