fix error

temp_file/Gemfile

@@ -6,6 +6,7 @@ if $0.to_s.scan('bundle').length==0
     system("bundle install") if !flag
   }
 end
+gem 'mime-types','~>3.3.1'
 gem 'mimemagic','0.3.9'
 gem 'public_suffix','~>3.1.1'
 gem "connection_pool","~>2.2.3"