Merge pull request #1629 from ydah/ydah/refactor

Remove unnecessary `$` for `RSpec/ChangeByZero`

Author: pirj

lib/rubocop/cop/rspec/change_by_zero.rb

@@ -77,7 +77,7 @@ class ChangeByZero < Base
             (block
               (send nil? :change)
               (args)
-              (send (...) $_)) :by
+              (send (...) _)) :by
             (int 0))
         PATTERN