patch 8.1.2201: cannot build with dynamically linked Python 3.8

Problem:    Cannot build with dynamically linked Python 3.8.
Solution:   Implement py3__Py_DECREF() and py3__Py_XDECREF(). (Ken Takata,
            closes #4080)
diff --git a/src/version.c b/src/version.c
index 60a690d..c2c5584 100644
--- a/src/version.c
+++ b/src/version.c
@@ -742,6 +742,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    2201,
+/**/
     2200,
 /**/
     2199,