Fix Flake8 lint warnings

[healeycodes]

🔧

./movegeneration.py:3:1: F401 'sys' imported but unused
./movegeneration.py:10:11: E221 multiple spaces before operator
./movegeneration.py:11:17: E222 multiple spaces after operator
./movegeneration.py:25:14: E712 comparison to True should be 'if cond is True:' or 'if cond:'
./movegeneration.py:81:1: C901 'minimax' is too complex (13)
./communication.py:20:1: C901 'command' is too complex (14)
./test/test_engine.py:155:128: E501 line too long (212 > 127 characters)
2     C901 'command' is too complex (14)
1     E221 multiple spaces before operator
1     E222 multiple spaces after operator
1     E501 line too long (212 > 127 characters)
1     E712 comparison to True should be 'if cond is True:' or 'if cond:'
1     F401 'sys' imported but unused