Add `cibuildwheel` (#53)
* Add cibuildwheel * Skip windows and pre-3.8 builds * Add sdist, upload steps to wheel build workflow * Fix build skip list * Add note about cibw config to CI yaml * Skip pre-3.8 pypy as well * Fix CI wheel trigger config
* Add cibuildwheel * Skip windows and pre-3.8 builds * Add sdist, upload steps to wheel build workflow * Fix build skip list * Add note about cibw config to CI yaml * Skip pre-3.8 pypy as well * Fix CI wheel trigger config