Twitter-oss: Prepare OSS libraries for release

Problem

We want to release the next versions our of Twitter OSS libraries:
  - util -> 6.38.0
  - ostrich -> 9.22
  - scrooge -> 4.12.0
  - finagle -> 6.39.0
  - twitter-server -> 1.24
  - finatra -> 2.5.0

Solution

Prepare libraries for their next releases.

RB_ID=879557

CHANGES

@@ -7,6 +7,11 @@ Note that ``RB_ID=#`` correspond to associated messages in commits.
 1.x
 -----
 
+1.24.0
+------
+
+No Changes
+
 1.23.0
 ------
 

project/Build.scala

@@ -9,9 +9,9 @@ object TwitterServer extends Build {
   val branch = Process("git" :: "rev-parse" :: "--abbrev-ref" :: "HEAD" :: Nil).!!.trim
   val suffix = if (branch == "master") "" else "-SNAPSHOT"
 
-  val libVersion = "1.23.0" + suffix
-  val utilVersion = "6.37.0" + suffix
-  val finagleVersion = "6.38.0" + suffix
+  val libVersion = "1.24.0" + suffix
+  val utilVersion = "6.38.0" + suffix
+  val finagleVersion = "6.39.0" + suffix
 
   val jacksonVersion = "2.6.5"
   val jacksonLibs = Seq(