Eliminate circular require warning
Eliminate circular require warning

https://travis-ci.org/itamae-kitchen/itamae/jobs/473222026
/home/travis/build/itamae-kitchen/itamae/lib/itamae.rb:3: warning: /home/travis/build/itamae-kitchen/itamae/lib/itamae.rb:3: warning: loading in progress, circular require considered harmful - /home/travis/build/itamae-kitchen/itamae/lib/itamae/cli.rb
	from bin/itamae:3:in  `<main>'
	from bin/itamae:3:in  `require'
	from /home/travis/build/itamae-kitchen/itamae/lib/itamae/cli.rb:1:in  `<top (required)>'
	from /home/travis/build/itamae-kitchen/itamae/lib/itamae/cli.rb:1:in  `require'
	from /home/travis/build/itamae-kitchen/itamae/lib/itamae.rb:3:in  `<top (required)>'
	from /home/travis/build/itamae-kitchen/itamae/lib/itamae.rb:3:in  `require'

itamae-kitchen/itamae,sue445/itamae,itamae-kitchen/itamae,sue445/itamae