0.1.6

Released on February 10, 2021.

• Dropped support for Python 2 and Pypy
• Declare this extension safe for parallel reading
• Migrate to Github Actions for CI
• Test against recent versions of Sphinx
• Format source code with Black
• Add documentation to the sdist
• Fixed unwanted <blockquote> tags in multi-line command descriptions that
  are indented to match surrounding code.

See also doc/changelog.rst