Fix Enum.slice deprecation warning in parse_udp (#176)

Author: bruschke

lib/tds/protocol.ex

@@ -394,7 +394,7 @@ defmodule Tds.Protocol do
     server =
       data
       |> String.split(";;")
-      |> Enum.slice(0..-2//-1)
+      |> Enum.drop(-1)
       |> Enum.reduce([], fn str, acc ->
         server =
           str