[ruby/reline] Fix test class not to overwrite

https://github.com/ruby/reline/commit/1e78984c49

test/reline/test_reline_key.rb

@@ -1,7 +1,7 @@
 require_relative 'helper'
 require "reline"
 
-class Reline::Test < Reline::TestCase
+class Reline::TestKey < Reline::TestCase
   def setup
   end