Set Gerrit API to v3.7.0-rc3

Change-Id: I98981b0e4ecfc160471ddd93744e64bbd084e801

build.sbt

diff --git a/build.sbt b/build.sbt
index 9e5666c..f34f073 100644
--- a/build.sbt
+++ b/build.sbt
@@ -1,6 +1,6 @@
 enablePlugins(GitVersioning)
 
-val gerritApiVersion = "3.6.0-rc0"
+val gerritApiVersion = "3.7.0-rc3"
 
 val pluginName = "analytics"