fix: 🚨 import Base for real instead of as a type-only import

this didn't even compile before, not sure how it got this way to begin with

Author: not-so-smart

src/structures/Message.ts

@@ -1,5 +1,6 @@
 import type { APIChatMessage, APIGroupMessage, DeleteGroupMessageResponse } from 'groupme-api-types'
-import type { Attachment, Channel, Client, Base, User } from '..'
+import type { Attachment, Channel, Client, User } from '..'
+import { Base } from '..'
 
 interface MessageInterface<T extends Channel> {
     fetch(): Promise<this>