use should include.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@64976 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

Author: ko1

command_line/dash_v_spec.rb

@@ -6,7 +6,7 @@
 
   describe "when used alone" do
     it "prints version and ends" do
-      ruby_exe(nil, args: '-v').include?(RUBY_DESCRIPTION).should == true
+      ruby_exe(nil, args: '-v').should include(RUBY_DESCRIPTION)
     end
   end
 end