Features

• Add support for mypy --strict. Original PR #147 by @victorphoenix3.

Docs

• Update docs with new --help showing default values. PR #135 by @victorphoenix3.
• Add Optional to docs for CLI Arguments and Options with a default of None. PR #131 by @rkbeatss.
• Add valid date formats to docs. PR #122 by @IamCathal.

Internal

• Report coverage in XML to support GitHub Actions. PR #146.
• Update badges and remove Travis, now that GitHub Actions is the main CI. PR #145.