v3.0.0

#68

BREAKING CHANGES

• support "乃木坂46メッセージ"
• save past messages which delivered up to 24 hours before subscription start
• -g option allow multiple
• do not save if a refresh token is not specified for a group

Changes

• improve development
  • create OpenAPI specifications
  • create docker environment to launch mock servers
• fix README for "乃木坂46メッセージ"
• fix doc for "乃木坂46メッセージ"

Full Changelog: v2.0.4...v3.0.0