fix<ALT>: usage of unsupported ronn gem in favor to ronn-ng

[malbajun]

• * changed usage of unsupported ronn gem in favor to ronn-ng

[puppetlabs-jenkins]

Can one of the admins verify this patch?

[CLAassistant]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution.
_{You have signed the CLA already but the status is still pending? Let us recheck it.}