Bump minimum required ruby version to 2.2.2
Bump minimum required ruby version to 2.2.2

Ruby 2.2 is still not compatible with the latest rack. We need to actually specify 2.2.2+ which is what rack and others now require.

Signed-off-by: Tim Smith <764ef62106582a09ed09dfa0b6bff7c05fd7d1e4@chef.io>

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