fix transient timing failure adding timecop

spec/serializers/analytics_build_entity_spec.rb

@@ -13,6 +13,14 @@ describe AnalyticsBuildEntity do
 
     subject { entity.as_json }
 
+    before do
+      Timecop.freeze
+    end
+
+    after do
+      Timecop.return
+    end
+
     it 'contains the URL' do
       expect(subject).to include(:url)
     end