Commits on Jan 8, 2019

1. Tweak document and message for Style/FlipFlop cop …

   flip-flop operator is deprecated since Ruby 2.6.0.
   
   > The flip-flop syntax is deprecated. [Feature rubocop#5400]
   
   - https://github.com/ruby/ruby/blob/v2_6_0/NEWS#language-changes
   - https://bugs.ruby-lang.org/issues/5400
   
   ```console
   % cat example.rb
   (1..20).each do |x|
     puts x if (x == 5) .. (x == 10)
   end
   
   % ruby -v
   ruby 2.6.0p0 (2018-12-25 revision 66547) [x86_64-darwin17]
   
   % ruby example.rb
   example.rb:2: warning: flip-flop is deprecated
   5
   6
   7
   8
   9
   10
   ```
   
   This PR tweaks document and offense message for `Style/FlipFlop` cop.
   It will more clarify the reason for checking flip-flop operator.

   

   koic committed Jan 8, 2019
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