[DRE-maint] ruby-gollum-lib is marked for autoremoval from testing

[Debian testing autoremoval watch]

ruby-gollum-lib 4.1.0-3 is marked for autoremoval from testing on 2016-06-01

It is affected by these RC bugs:
821821: ruby-gollum-lib: gitlab: fails to install in sid: Bundler could not find compatible versions for gem "github-markup"
821381: ruby-gollum-lib: ruby-gollum-lib not working with ruby-github-markup 1.4.0
823046: ruby-gollum-lib: FTBFS:  Could not find 'github-markup' (~> 1.3.3) - did find: [github-markup-1.4.0] (Gem::LoadError)