[DRE-maint] Bug#821381: ruby-gollum-lib not working with ruby-github-markup 1.4.0

[Matthias Klose]

Package: src:ruby-gollum-lib
Version: 4.1.0-3
Severity: serious
Tags: sid stretch

ruby-gollum-lib is not working with the new ruby-github-markup 1.4.0. One 
symptom are the failing autopkg tests.

https://ci.debian.net/data/packages/unstable/amd64/r/ruby-gollum-lib/latest-autopkgtest/log.gz

GEM_PATH= ruby2.3 -e gem\ \"gollum-lib\"
/usr/lib/ruby/2.3.0/rubygems/dependency.rb:319:in `to_specs': Could not find 
'github-markup' (~> 1.3.3) - did find: [github-markup-1.4.0] (Gem::LoadError)
Checked in 
'GEM_PATH=/home/debci/.gem/ruby/2.3.0:/var/lib/gems/2.3.0:/usr/lib/x86_64-linux-gnu/rubygems-integration/2.3.0:/usr/share/rubygems-integration/2.3.0:/usr/share/rubygems-integration/all', 
execute `gem env` for more information
	from /usr/lib/ruby/2.3.0/rubygems/specification.rb:1438:in `block in 
activate_dependencies'
	from /usr/lib/ruby/2.3.0/rubygems/specification.rb:1427:in `each'
	from /usr/lib/ruby/2.3.0/rubygems/specification.rb:1427:in `activate_dependencies'
	from /usr/lib/ruby/2.3.0/rubygems/specification.rb:1409:in `activate'
	from /usr/lib/ruby/2.3.0/rubygems/core_ext/kernel_gem.rb:68:in `block in gem'
	from /usr/lib/ruby/2.3.0/rubygems/core_ext/kernel_gem.rb:67:in `synchronize'
	from /usr/lib/ruby/2.3.0/rubygems/core_ext/kernel_gem.rb:67:in `gem'
	from -e:1:in `<main>'