disabled unimportant warning messages

Author: taichi-ishitani

spec/spec_helper.rb

@@ -65,7 +65,7 @@
 
   # This setting enables warnings. It's recommended, but in some cases may
   # be too noisy due to issues in dependencies.
-  config.warnings = true
+  config.warnings = false
 
   # Many RSpec users commonly either run the entire suite or an individual
   # file, and it's useful to allow more verbose output when running an