fix deprecation warning for `after_rollback`/`after_commit` callbacks

DEPRECATION WARNING: Currently, Active Record suppresses errors raised within `after_rollback`/`after_commit` callbacks and only print them to the logs. In the next version, these errors will no longer be suppressed. Instead, the errors will propagate normally just like in other Active Record callbacks.

apply the deprecation fix for ActiveRecord >= 4.2 only

test/paranoia_test.rb

 require 'active_record'
 require 'active_record'
+ActiveRecord::Base.raise_in_transactional_callbacks = true if ActiveRecord::VERSION::STRING >= '4.2'
 
 
 test_framework = if ActiveRecord::VERSION::STRING >= "4.1"
 test_framework = if ActiveRecord::VERSION::STRING >= "4.1"
   require 'minitest/autorun'
   require 'minitest/autorun'