patch 8.0.0962: crash with virtualedit and joining lines

Problem:    Crash with virtualedit and joining lines. (Joshua T Corbin, Neovim
            #6726)
Solution:   When using a mark check that coladd is valid.
diff --git a/src/version.c b/src/version.c
index a25bbad..1ba0073 100644
--- a/src/version.c
+++ b/src/version.c
@@ -770,6 +770,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    962,
+/**/
     961,
 /**/
     960,