Road to v2

[buren]

• Optimize for Ruby 3.0, 2.7 is EOL March 31, 2023 so should still be supported in v2 (in my opinion)
• Handle rate limiting HTTP 429, see Rate limiting – HTTP 429, Too Many Requests #32.
• Report functionality
  • --report flag with CSV output for the CLI
  • Return some report object when used in Ruby
• Go for backwards compatibility, might do some breaking chances if the API would be significantly improved
• Perhaps support other archiving services, like archive.is
• Proper configuration with configure block, WaybackArchiver.configure { |c| ... } instead of using top-level functions like WaybackArchiver.user_agent= (current configuration)
• ... and more

Happy for any input!