v2.2.0

• Package: Require r-result
• Bugfix: Cast timestamp to Number in RPL_TOPICWHOTIME
• Enhancement: Breaking: Make .join("#channel") return a Promise<Result<JoinInfo, FailMessage>, Error>
• Enhancement: Change JoinInfo to be better designed.
• Bugfix: Quit showing errors on successful joins.
• Tests: Test Join succeeds case, Timeout case.
• Enhancement: Client.whois(user) returns a Promise<Result<WhoisInfo, FailMessage>, Error>
• Refactor: User plugin's isIdentifiedas(nickname) function now uses Client.whois's promise.
• Enhancement: Message extensions for 421 (ERR_UNKNOWNCOMMAND)
• Enhancement: Add message.channels to RPL_WHOISCHANNELS
• Enhancement: Added more whois response message extensions.
• Bugfix: Unsubscribe from timeouts when unsubscribing handlers in .join(), .whois().
• Bugfix: Normalize channel properties in new message handlers to lowercase as specified in docs.