0.4.0

Operational, added features / command line options:

• input alignment now required arg: vircov test.paf [previously: --paf option]
• filter results output by
  • --seq-len: minimum reference sequence length
  • --cov-reg minimum number of detected coverage regions
• long help menu with --help
• pretty table output with --table
• 100% test coverage 🥳
• continuous integration for Linux and MacOS