patch 8.1.1890: ml_get error when deleting fold marker

Problem:    Ml_get error when deleting fold marker.
Solution:   Check that the line number is not below the last line.  Adjust the
            fold when deleting the empty line.  (Christian Brabandt,
            closes #4834)
diff --git a/src/version.c b/src/version.c
index d7bdfa2..c6944cf 100644
--- a/src/version.c
+++ b/src/version.c
@@ -766,6 +766,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1890,
+/**/
     1889,
 /**/
     1888,