patch 8.0.0288: errors reported while running tests

Problem:    Errors reported while running tests.
Solution:   Put comma in the right place.
diff --git a/src/version.c b/src/version.c
index ae1e48e..4e041c6 100644
--- a/src/version.c
+++ b/src/version.c
@@ -765,6 +765,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    288,
+/**/
     287,
 /**/
     286,