make Recipients public on dm channel

[Qreepex]

This pull request updates the DMChannel struct and its related methods in discord/channel.go to make the Recipients field exported (publicly accessible), and ensures consistent usage of the new field name throughout the codebase.

Exporting struct fields for external access:

• Changed the recipients field in the DMChannel struct to Recipients to make it exported and accessible outside the package.

Code consistency and refactoring:

• Updated all references to the recipients field in the UnmarshalJSON, MarshalJSON, and Name methods to use the new Recipients field name. [1] [2] [3]

[topi314]

Ty Boss