patch 8.0.1806: InsertCharPre causes problems for autocomplete

Problem:    InsertCharPre causes problems for autocomplete. (Lifepillar)
Solution:   Check for InsertCharPre before calling vpeekc(). (Christian
            Brabandt, closes #2876)
diff --git a/src/version.c b/src/version.c
index b81046e..5ebf701 100644
--- a/src/version.c
+++ b/src/version.c
@@ -762,6 +762,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1806,
+/**/
     1805,
 /**/
     1804,