patch 8.2.2346: Codecov reports every little coverage drop

Problem:    Codecov reports every little coverage drop.
Solution:   Tolerate a 0.05% drop. Hide the appveyor config file. (Ozaki
            Kiichi, closes #7678)
diff --git a/src/version.c b/src/version.c
index 30a550f..56522d9 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    2346,
+/**/
     2345,
 /**/
     2344,