Bump Gerrit API to 3.4.0-SNAPSHOT

Change-Id: I4dca3c8f92ba157baa862ec40766f9180ddfd7f4

build.sbt

diff --git a/build.sbt b/build.sbt
index 74e189c..306c326 100644
--- a/build.sbt
+++ b/build.sbt
@@ -1,6 +1,6 @@
 enablePlugins(GitVersioning)
 
-val gerritApiVersion = "3.3.0-SNAPSHOT"
+val gerritApiVersion = "3.4.0-SNAPSHOT"
 
 val pluginName = "analytics"