[DRE-maint] nanoc is marked for autoremoval from testing

[Debian testing autoremoval watch]

nanoc 4.8.10-1 is marked for autoremoval from testing on 2018-04-04

It is affected by these RC bugs:
892195: nanoc: nanoc FTBFS with Ruby 2.5: test failure

It (build-)depends on packages with these RC bugs:
893822: ruby-pygments.rb: ruby-pygments.rb FTBFS with Ruby 2.5