Remove wrong comment [skip ci]

Arthur Nogueira Neves · Arthur Nogueira Neves · commit 6cfa5ee9066d · 2016-02-24T18:23:49.000-05:00
per 0c7915c I guess jeweler is not used anymore.
diff --git a/oauth.gemspec b/oauth.gemspec
@@ -1,6 +1,3 @@
-# Generated by jeweler
-# DO NOT EDIT THIS FILE DIRECTLY
-# Instead, edit Jeweler::Tasks in Rakefile, and run 'rake gemspec'
 # -*- encoding: utf-8 -*-
 
 lib = File.expand_path("../lib/", __FILE__)
