update ruby to 2.4.4 and bundler to 1.16.0 (#860)
update ruby to 2.4.4 and bundler to 1.16.0 (#860)


cloudify-cosmo/cloudify-cli,mahak/cloudify-cli,mahak/cloudify-cli,cloudify-cosmo/cloudify-cli,mahak/cloudify-cli,mahak/cloudify-cli