Release v0.10.0

What's Changed

• Remove several mentions of Python 2 by @jafingerhut in #190
• Only push tagged versions to PyPI by @antoninbas in #191
• Fix ptf --version by @antoninbas in #196
• Replace use of deprecated package imp with current importlib by @jafingerhut in #189
• Remove empty requirements.txt to avoid install issues on some platforms by @jafingerhut in #199
  • Credit also goes to @liushilongbuaa for reporting the issue and submitting an initial patch

Full Changelog: v0.9.4...v0.10.0