fixed badarg issue

Hi (again) -- I ran into an issue:

    ** {badarg,[{erlang,bit_size,
                        [[<<".">>,<<"hsd1">>,<<".">>,<<"ct">>,<<".">>,
                          <<"comcast">>,<<".">>,<<"net">>]],
                        []},
                {'Elixir.ExIrc.Utils',parse_from,2,
                                      [{file,"lib/exirc/utils.ex"},{line,31}]},

that seems to be rectified by a small patch.  Thanks!