Prep for 8.13.18 release 

Prep for 8.13.17 release 

Prep for 8.13.16 release 

ci: no python-2.7 in setup-python Despite using a pinned hash for the setup-python v4 action, it has nevertheless changed under us so that Python 2.7 is no longer supported. See actions/setup-python#672 Drop 2.7 from the matrix and just rely on the pypy27 entry for checking Python 2.x builds.

Prep for 8.13.14 release 

Prep for 8.13.13 release 

Prep for 8.13.11 release 

Prep for 8.13.10 release 

ci: move to ubuntu-20.04 Drop builds for 3.3 and 3.4

Prep for 8.13.8 release