patch 8.1.1402: "timer" option of popup windows not supported

Problem:    "timer" option of popup windows not supported.
Solution:   Implement the "timer" option. (Yasuhiro Matsumoto, closes #4439)
diff --git a/src/version.c b/src/version.c
index 940ac14..f974b6b 100644
--- a/src/version.c
+++ b/src/version.c
@@ -768,6 +768,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1402,
+/**/
     1401,
 /**/
     1400,