Pass host as address

[kwisath]

The host parameter was passed to the start function (even there is an assertion on it), but it was not used on the code. This parameter is needed in case the server is run inside a docker container for instance, in which typically we would use 0.0.0.0 instead of the default localhost.

Note also that the version of the function without arguments will just pass nil, causing the assertion to trigger, which I guess it is not the intended behavior (although I did not modify it, just in case it was intended)