[DRE-maint] ruby-gitlab-flowdock-git-hook is marked for autoremoval from testing

[Debian testing autoremoval watch]

ruby-gitlab-flowdock-git-hook 1.0.1-2 is marked for autoremoval from testing on 2017-09-15

It (build-)depends on packages with these RC bugs:
867649: ruby-flowdock: FTBFS: ERROR: Test "ruby2.3" failed: Failure/Error: resp = self.class.delete(api_url(path), :basic_auth => {:username => @api_token, :password => ''}, :headers => headers)