Silence `:rubygems` Bundler deprecation notice.
Silence `:rubygems` Bundler deprecation notice.

Message from Bundler before this change:

The source :rubygems is deprecated because HTTP requests are insecure.

Please change your source to 'https://rubygems.org' if possible, or
'http://rubygems.org' if not.

opscode-cookbooks/opscode-dev-shim