Fix incorrect types passed to PyArg_ParseTupleAndKeywords

For a similar reason as `Py_BuildValue`, telling Python to use a smaller
sized value than actually passed may cause strange values to end up in
the result.

src/Automaton.c

@@ -890,7 +890,7 @@ automaton_iter(PyObject* self, PyObject* args, PyObject* keywds) {
         return NULL;
     }
 
-    if (!F(PyArg_ParseTupleAndKeywords)(args, keywds, "O|iii", kwlist, &object, &start_tmp, &end_tmp, &ignore_white_space_tmp)) {
+    if (!F(PyArg_ParseTupleAndKeywords)(args, keywds, "O|nni", kwlist, &object, &start_tmp, &end_tmp, &ignore_white_space_tmp)) {
         return NULL;
     }