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Add support for multiple DNSBL zones. The new defaults are 'dnsbl.dronebl.org', 'rbl.efnetrbl.org', and 'tor.dnsbl.sectoor.de'. I've added in the option to modify zones via config.js as:
I have chosen to use Promise, which is only supported with Node.js >=v4.x, however LTS for anything under v4.x expires at the end of 2016 so I believe this should be fine.