Update link to buganizer in README.md

Change-Id: I5dbc446043e8bd87f394c4f0ab66355dcb6caa0f
Reviewed-on: https://gn-review.googlesource.com/c/gn/+/19481
Reviewed-by: Sylvain Defresne <sdefresne@chromium.org>
Commit-Queue: Sylvain Defresne <sdefresne@chromium.org>

README.md

diff --git a/README.md b/README.md
index 444b459..3dd5219 100644
--- a/README.md
+++ b/README.md
@@ -148,7 +148,7 @@
 ## Reporting bugs
 
 If you find a bug, you can see if it is known or report it in the [bug
-database](https://bugs.chromium.org/p/gn/issues/list).
+database](https://gn.g-issues.chromium.org/issues/new).
 
 ## Sending patches