Test on other OSs, remove CI benchmarks (#366)
* Test on other OSes, remove benchmarks
* fix pytest-speed for 3.7
* remove windows xfail, revert pyproject changes
* uprev pytest, pytest-pretty
* add print to windows
* more eprints
* remove test-os py cache
* remove extra prints
* revert xfail
* remove pytest-speed on codspeed ci
* install ptyest-benchmark with codspeed
* clear codspeed cache
