This was missing for some reason while the Python 2.7 stubs have it.
Sample test code:
% cat testtype.py
A = type('A', (), {})
print(A.__name__)
Results before:
% python -m mypy --py2 testtype.py
% python -m mypy testtype.py
testtype.py:1: error: Too many arguments for "type"
%
Results after: type checking passes in both modes.
