Simplify case statement a bit

lib/nurina.ex

@@ -58,9 +58,9 @@ defmodule Nurina do
         case Integer.parse rest do
             :error -> %{parsed | valid: false}
 
-            {_, remainder} when remainder != "" -> %{parsed | valid: false}
-
-            {port, _} -> %{parsed | port: port}
+            {port, ""} -> %{parsed | port: port}
+            
+            _ -> %{parsed | valid: false}
         end
     end
     def parse(_,                         parsed, :port), do: %{parsed | port: nil, valid: false}