Log Message:
devel/ruby-mocha: update to 1.4.0

1.4.0 (2018/03/20)

* Fix deprecation warning for assert_nil in ClassMethodTest (#308 & #309)
* Display file and line number in deprecation warning - thanks to @chrisarcand
  (#310, #312 & #313)
* Rename mocha/mini_test.rb to mocha/minitest.rb - thanks to @grosser (#320 &
  #322)
* Fix warning when delegating to mock in Ruby 2.4 - thanks to @tjvc (#321 &
  #323)
* Updates to Travis CI configuration (73af600..9732726 & 0426e5e)