Race condition in ActionController::Serialization::ImplicitSerializerTest#test_render_fragment_changed_object_with_relationship

[bf4]

Should be an easy fix if anyone wants to pick it up.

ref: https://travis-ci.org/rails-api/active_model_serializers/jobs/67701995

rails-api/active_model_serializers/test/action_controller/serialization_test.rb:300]:
--- expected
+++ actual
@@ -1 +1 @@
-{"id"=>1, "time"=>"2015-06-21T04:45:29+00:00", "post"=>{"id"=>1, "title"=>"New Post", "body"=>"Body"}}
+{"id"=>1, "time"=>"2015-06-21T04:45:28+00:00", "post"=>{"id"=>1, "title"=>"New Post", "body"=>"Body"}}

[kurko]

Yeah. We can use Timecop.