Update bug database link.

Change-Id: Ied30cf1da2f42e48a39b94f325983a423ed22c79
Reviewed-on: https://gn-review.googlesource.com/c/gn/+/17660
Reviewed-by: Takuto Ikuta <tikuta@google.com>
Commit-Queue: Brett Wilson <brettw@google.com>

README.md

diff --git a/README.md b/README.md
index f96d895..444b459 100644
--- a/README.md
+++ b/README.md
@@ -13,7 +13,7 @@
        (all builtin help converted to a single file).
   * An introductory [presentation](https://docs.google.com/presentation/d/15Zwb53JcncHfEwHpnG_PoIbbzQ3GQi_cpujYwbpcbZo/edit?usp=sharing).
   * The [mailing list](https://groups.google.com/a/chromium.org/forum/#!forum/gn-dev).
-  * The [bug database](https://bugs.chromium.org/p/gn/issues/list).
+  * The [bug database](https://gn.issues.chromium.org/issues?q=status:open).
 
 ## What GN is for