Log Message:
py-setuptools_scm: updated to 3.3.3

v3.3.3
* add eggs for python3.7 and 3.8 to the deploy

v3.3.2
* fix 335 - fix python3.8 support and add builds for up to python3.8

v3.3.1
* fix 333 (regression from 198) - use a specific fallback root when calling \ 
fallbacks. Remove old
  hack that resets the root when fallback entrypoints are present.

v3.3.0
* fix 198 by adding the fallback_version option, which sets the version to be \ 
used when everything else fails.