Fix quote inconsistency

lib/google/apis/core/upload.rb

@@ -18,7 +18,7 @@ require 'google/apis/core/api_command'
 require 'google/apis/errors'
 require 'addressable/uri'
 require 'mime-types'
-require "tempfile"
+require 'tempfile'
 
 module Google
   module Apis