Sort target files so that the resulting offences will be sorted

lib/guard/rubocop.rb

@@ -77,7 +77,7 @@ def clean_paths(paths)
         next true unless File.exists?(path)
         included_in_other_path?(path, paths)
       end
-      paths
+      paths.sort
     end
 
     def included_in_other_path?(target_path, other_paths)