Update lib/otr.js

plaintext messages with german letters has a encoding issue. "äöüß" looks like "Ã¤Ã¶Ã¼Ã".

Signed-off-by: Arlo Breault <arlolra@gmail.com>
Update lib/otr.js

Handle TLV of type 1

Signed-off-by: Arlo Breault <arlolra@gmail.com>
tests for disconnect