Allow buildpack-packager to use ruby 2.3.1
Allow buildpack-packager to use ruby 2.3.1

[#126143393]

Signed-off-by: Gabriel Ramirez <b6b1c3a96b86f6839fb87789d791fccb84e5dc25@gmail.com>

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