Complete Gerrit class definition

Change-Id: I24aaebf386ca7d3ef19abb76c4c6e7737f39f264

gerrit.rb

diff --git a/gerrit.rb b/gerrit.rb
index 9262bca..cf52959 100644
--- a/gerrit.rb
+++ b/gerrit.rb
@@ -2,3 +2,4 @@
 # frozen_string_literal: true
 
 class Gerrit < GerritAT3110
+end