patch 8.2.3937: Insert mode completion function is too long

Problem:    Insert mode completion function is too long.
Solution:   Refactor into multiple functions. (Yegappan Lakshmanan,
            closes #9423)
diff --git a/src/version.c b/src/version.c
index 8aebc2c..68ce1c5 100644
--- a/src/version.c
+++ b/src/version.c
@@ -750,6 +750,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    3937,
+/**/
     3936,
 /**/
     3935,