FLUME-1693: Update release notes
FLUME-1693: Update release notes

(Brock Noland via Brock Noland)

iaiengxia/flume,szaboferee/flume,tinawenqiao/flume,tinawenqiao/flume,tmgstevens/flume,iaiengxia/flume,szaboferee/flume,tmgstevens/flume,iaiengxia/flume,tmgstevens/flume,tmgstevens/flume,tinawenqiao/flume,tinawenqiao/flume,iaiengxia/flume,szaboferee/flume,szaboferee/flume