Version 220.127.116.11-3 of ruby-gollum-lib is marked for autoremoval from testing on Thu 11 Oct 2018. It depends (transitively) on gumbo-parser, affected by #891098. You should try to prevent the removal by fixing these RC bugs.
Last update: 2018-09-22
Standards version of the package is outdated.
The package should be updated to follow the last version of Debian Policy
(Standards-Version 4.2.1 instead of