remove explicit require for thread_safe

ritikesh · ritikesh · commit 29d8be452fb3 · 2020-10-12T19:38:05.000+05:30
diff --git a/lib/active_model/serializer.rb b/lib/active_model/serializer.rb
@@ -1,6 +1,5 @@
 # frozen_string_literal: true
 
-require 'thread_safe'
 require 'jsonapi/include_directive'
 require 'active_model/serializer/collection_serializer'
 require 'active_model/serializer/array_serializer'
