Changelog:
154964b Add fallback dns check
974c14d Update config options
c4ddb7f Add MarshalJSON support to RRCache
ff31b7c Add dns and tunnel context to conntection
a085b6d Update dependencies
d8ced7e Improve logging
17da727 Improve captive portal notification handling
7e21e7c Remove obsolete devMode option instance
b716f56 Fix dns request handling when failing
b84cb08 Fix hanging dns queries on shutdown
8a4ac91 Add and fix port range rules and update documentation for it