Problem

We want to release the next versions our of Twitter OSS libraries:
 - util -> 6.36.0
 - ostrich -> 9.20
 - scrooge -> 4.9.0
 - finagle -> 6.37.0
 - twitter-server -> 1.22
 - finatra -> 2.3.0

Solution

Prepare libraries for their next releases.

RB_ID=865948
TBR=true