Gemfile.rails-5.2 in activity_notification-2.1.4

- old
+ new

@@ -8,9 +8,10 @@
   gem 'bullet'
   gem 'rack-cors'
 end
 
 group :test do
+  gem 'rspec-rails', '< 4.0.0'
   gem 'rails-controller-testing'
   gem 'action-cable-testing'
   gem 'ammeter'
   gem 'timecop'
   gem 'committee'