Support all of the parameters to edit a message

[joelzwarrington]

Discord API supports the following parameters when editing a message: content, embeds, flags, allowed_mentions, components, fields, but these are not all supported by discordrb.
¹

discordrb/lib/discordrb/data/message.rb

Line 201 in 4551619

def edit(new_content, new_embeds = nil, new_components = nil)

Also, content is an optional argument, but is made required in the method.

Footnotes

1. https://discord.com/developers/docs/resources/channel#edit-message ↩