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

[Debian testing autoremoval watch]

nanoc 4.3.4-1 is marked for autoremoval from testing on 2017-01-16

It (build-)depends on packages with these RC bugs:
846738: ruby-uglifier: FTBFS: ERROR: Test "ruby2.3" failed: Failure/Error: expect(Uglifier.new.compile('var foo="\0bar"')).to include("\\x00bar")