* Update the RUN_DEPENDS and limit the port to Python 3.6 or newer as the
support for Python 2.7 and 3.5 was dropped with the 0.15.0 release.
Python 3.6 needs also the devel/py-dataclasses package as an additional
dependency to work properly.
* Add a "do-test" target while I'm here to make future QA easier.
* Bump PORTREVISION for package change.
PR: 242025 (related)
Approved by: portmgr blanket (runtime fix)
MFH: 2019Q4 (runtime fix)
b60319e273