fixup for working with chef 11.6.2

[webframp]

if you want it

[martinisoft]

+1 to this change, cannot use release to publish chef-rvm with Chef 11.6.2 here is an example error output.

% rake release
Generating metadata for rvm from /var/folders/h5/dynhzgcj3v76k_yk8lmnbg3r0000gn/T/chef-rvm-build20140331-72513-d0pgs9/rvm/metadata.rb
ERROR: ERROR: Error making tarball rvm.tgz: uninitialized constant Chef::Mixin::Command. Set log level to debug (-l debug) for more information.
rake aborted!
Knife Plugin exited with error code: 1
/Users/martinisoft/.rvm/gems/ruby-2.1.1@chef-rvm/gems/emeril-0.7.0/lib/emeril/publisher.rb:127:in `exit'
/Users/martinisoft/.rvm/gems/ruby-2.1.1@chef-rvm/gems/chef-11.6.2/lib/chef/knife/cookbook_site_share.rb:63:in `rescue in run'
/Users/martinisoft/.rvm/gems/ruby-2.1.1@chef-rvm/gems/chef-11.6.2/lib/chef/knife/cookbook_site_share.rb:56:in `run'
/Users/martinisoft/.rvm/gems/ruby-2.1.1@chef-rvm/gems/emeril-0.7.0/lib/emeril/publisher.rb:53:in `run'
/Users/martinisoft/.rvm/gems/ruby-2.1.1@chef-rvm/gems/emeril-0.7.0/lib/emeril/releaser.rb:47:in `run'
/Users/martinisoft/.rvm/gems/ruby-2.1.1@chef-rvm/gems/emeril-0.7.0/lib/emeril/rake_tasks.rb:37:in `block in define'
Tasks: TOP => release
(See full trace by running task with --trace)

[fnichol]

Okay, let's make this work 😄