#542 close the fake spec_helper.rb so the directory can be removed with the after(:each)

Author: soobrakay

spec/actions/directory_spec.rb

@@ -154,7 +154,7 @@ def exists_and_identical?(source_path, destination_path)
       before(:each) do
         @temp_dir = Dir.mktmpdir("thor")
         Dir.mkdir(spec_dir)
-        File.new(File.join(spec_dir, "spec_helper.rb"), "w")
+        File.new(File.join(spec_dir, "spec_helper.rb"), "w").close
       end
 
       after(:each) { FileUtils.rm_rf(@temp_dir) }