Perhaps a nice enhancement on the documentation pa...

# ktor

[Albert]

Perhaps a nice enhancement on the documentation part of https://github.com/ktorio/ktor/blob/master/ktor-http/ktor-http-cio/src/io/ktor/http/cio/websocket/Frame.kt
I used val frame = Frame.Text("foo") and send frame concurrently (I thought it was thread-safe), and got a BufferUnderflowException out of it. The cause is the underlying Buffer https://docs.oracle.com/javase/7/docs/api/java/nio/Buffer.html.
For me it would've been useful if the documentation states Frame is not thread-safe