[DRE-maint] Bug#921637: [pkg-go] Bug#921637: FTBFS: /usr/lib/ruby/vendor_ruby/ronn/roff.rb:165:in `block_filter': undefined method

[Andrew Janke]

I've confirmed this is the https://github.com/apjanke/ronn-ng/issues/24 
bug in ronn-ng.

It looks liike an easy fix and I have pushed a ronn-ng 0.8.1.beta.1 
gem/release with the fix. Are you able to test against a prerelease gem?

I've tested locally and it fixed the problem for git-lfs man generation. 
I've also added an ordered-list example to Ronn-NG's internal test suite.

Cheers,
Andrew