updated for version 7.4.420
Problem:    It's not obvious how to add a new test.
Solution:   Add a README file. (Christian Brabandt)
diff --git a/src/version.c b/src/version.c
index d2ea613..a34bef2 100644
--- a/src/version.c
+++ b/src/version.c
@@ -742,6 +742,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    420,
+/**/
     419,
 /**/
     418,