Twitter OSS: Prepare libraries for next release

Problem

We're releasing the next versions of the Twitter OSS libraries:
util - 6.34.0
ostrich - 9.18.0
scrooge - 4.7.0
finagle - 6.35.0
twitter-server - 1.20.0
finatra - 2.1.6

Solution

Update to the release version.

RB_ID=826660

CHANGES

@@ -1,3 +1,7 @@
+9.18.0
+-----
+release: 26 April 2016
+
 - Register Ostrich as a Library in the /admin/registry.json. ``RB_ID=825129``
 
 9.17.0

project/Build.scala

@@ -7,8 +7,8 @@ object Ostrich extends Build {
   val branch = Process("git" :: "rev-parse" :: "--abbrev-ref" :: "HEAD" :: Nil).!!.trim
   val suffix = if (branch == "master") "" else "-SNAPSHOT"
 
-  val libVersion = "9.17.0" + suffix
-  val utilVersion = "6.33.0" + suffix
+  val libVersion = "9.18.0" + suffix
+  val utilVersion = "6.34.0" + suffix
 
   val sharedSettings = Seq(
     name := "ostrich",