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

[Debian testing autoremoval watch]

ruby-flowdock 0.7.0-1 is marked for autoremoval from testing on 2017-08-21

It is affected by 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)