Naming/RescuedExceptionsVariableName does not handle variables with underscore

[anthony-robin]

After upgrading to Rubocop v0.67.2, if we use a variable name with a leading _, the offense message ask to rename it without the underscore which flag a new Lint/UselessAssignment offense.

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Expected behavior

The cop should deal with underscored variable name and ask to rename it keeping the _.

Actual behavior

Rubocop ask me to rename my variable e whereas it should be _e.

Steps to reproduce the problem

class MyController < ApplicationController
  def create
    # some code here
  rescue MyException => _exception
    render_my_exception
  end
end

RuboCop version

$ [bundle exec] rubocop -V
0.67.2 (using Parser 2.6.2.1, running on ruby 2.6.1 x86_64-darwin18)