Lock ruby version to 2.2.x [#101610504]
Lock ruby version to 2.2.x [#101610504]

Signed-off-by: Anthony Emengo <7b3c5a7825e2f856203b8d882230abcb78036abf@pivotal.io>

cloudfoundry-incubator/buildpack-packager,cloudfoundry/buildpack-packager