Changes

Summary

1. Add Message.Attachment#getContentType (#1576) (commit: 525f1a9) (details)

Commit 525f1a9e3baf15d23a5a6471b8bf9b26645676b7 by noreply Add Message.Attachment#getContentType (#1576) (commit: 525f1a9)
	src/main/java/net/dv8tion/jda/internal/entities/EntityBuilder.java (diff)
	src/main/java/net/dv8tion/jda/api/entities/Message.java (diff)