Merge pull request mavlink#187 from mavlink/publish-pure-wheel

Publish pure wheel

Merge pull request mavlink#148 from mavlink/pr-add-description-type

setup.py: add type of long_description

Merge pull request mavlink#147 from mavlink/pr-fix-server-args

Update to v0.23.0 server and set default args

Merge pull request mavlink#143 from mavlink/138-fix-download-mission

Fix mission download

Merge pull request mavlink#142 from mavlink/fix-win-again

travis-ci: only upload one file

Merge pull request mavlink#141 from mavlink/fix-win

travis-ci: add Windows 32 bit

Merge branch 'fix-macos-wheel-name'

travis-ci: try to deploy to PyPi using twine

Merge pull request mavlink#127 from mavlink/bump-version

Bump C++ version to v0.21.1

prepare for release 0.3.0