2.0.0 - Bug Fixes, Code Overhaul, Additions

This is marked as a breaking change only because of how echoes appear from now on. Instead of wrapping the message contents within a message, each echoed message will now result in two messages from EchoBot:

• A header, indicating where the message came from and announcing a new message (remove the title and includeSource options or set them to false to remove the header)
• A body, which is the exact message copied in its entirety as close as possible to the source.

Previously the bot would send one message trying to do both at the same time, but this had more problems than it was worth.

This also means that bugs have been fixed, such as not copying all the information from an embed (#2) and not being able to copy messages that repeat contents (#8).

Finally, we have two new options: minLength and allowList. See the README for info on what these do.