Merge pull request mavlink#223 from mavlink/pr-bump-mavsdk-version

mavsdk_server: bump version to v0.28.0

Merge pull request mavlink#212 from mavlink/pr-fix-docs

sphinx: fix path to create docs

Merge pull request mavlink#209 from mavlink/pr-fix-modules-docs

Attempt to fix docs and imports

Merge pull request mavlink#204 from mavlink/pr-s3

travis-ci: try to get the s3 credentiels right

Merge pull request mavlink#203 from mavlink/pr-readme

Generate API docs in CI

Merge pull request mavlink#196 from mavlink/pr-version-bump

Bump mavsdk_server version to v0.27.0

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