• Breaking change: the RateLimited field in the Registration struct is now a pointer, so that it can be omitted entirely.
• Merged initial SSSS/cross-signing code by @nikofil. Interactive verification doesn't work, but the other things mostly do.
• Added support for authorization header auth in appservices (MSC2832).
• Added support for receiving ephemeral events directly (MSC2409).
• Fixed SendReaction() and other similar methods in the Client struct.
• Fixed crypto cgo code panicking in Go 1.15.3+.
• Fixed olm session locks sometime getting deadlocked.