Commits on May 10, 2020

1. Add new Layout/EmptyLineAroundAttributeAccessor cop …

   This PR adds new `Layout/EmptyLineAroundAttributeAccessor` cop
   that checks for a newline after attribute accessor.
   
   ```ruby
   # bad
   attr_accessor :foo
   def do_something
   end
   
   # good
   attr_accessor :foo
   
   def do_something
   end
   
   # good
   attr_accessor :foo
   attr_reader :bar
   attr_writer :baz
   attr :qux
   
   def do_something
   end
   ```
   
   This PR first checks an empty line after an attribute accessor to
   implement the example shown in The Ruby Style Guide's rule.
   rubocop/ruby-style-guide#817
   
   In the future this cop will provide an `EnforcedStyle: around` that
   checks empty lines before and after an attribute accessor, and this
   `EnforcedStyle: only_after` option could be users selectable option.

   

   koic committed May 10, 2020
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