Add code generation policy.

update hypothesis dep version for dev env

remove docs reference to deleted requirements/development.txt

Add link to discord server. (#1473)

Add files for packaging to gitignore.

Release version 4.14.0

Add EvolvedAttention: A transformer-based neural network strategy for Prisoner's Dilemma (#1471)

This PR adds the Momentum strategy (#1469)

Get mypy working again (#1457)

add original index to summary (#1466)

add freqAnalyzer strategy (#1444)

Add/update a few citations (#1464)

Improve extend method in LimitedHistory to enforce memory depth (#1458)

Merge pull request #1453 from gaffney2010/change-cache-pattern

Merge pull request #1456 from gaffney2010/match_generator