Commits on Jun 23, 2017

1. Fix useless operator warnings …

   `Forwardable._valid_method?` warns about useless operator when it is received an operator such as `*` and `+`.
   
   ```bash
   $ RUBYOPT='-w' ruby -rforwardable -e 'Forwardable._valid_method?(:*)'
   <compiled>: warning: possibly useless use of * in void context
   ```
   
   This behavior is problematic when a delegator is defined for an operator.
   For example:
   
   ```ruby
   require 'forwardable'
   
   class A
     extend Forwardable
   
     def s
       's'
     end
   
     def_delegator :s, :* # <compiled>: warning: possibly useless use of * in void context
   end
   
   p(A.new * 10) # => "ssssssssss"
   ```

   

   pocke committed Jun 23, 2017
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