patch 8.2.3444: concealed text not revealed when leaving insert mode

Problem:    concealed text not revealed when leaving insert mode. (Michael
            Soyka)
Solution:   Check if concealing changed when leaving insert mode.
            (closes #8880)
diff --git a/src/version.c b/src/version.c
index 4d55924..0b714bf 100644
--- a/src/version.c
+++ b/src/version.c
@@ -756,6 +756,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    3444,
+/**/
     3443,
 /**/
     3442,