README.md: update issues link to use pkgsite label

Change-Id: Ibc2ec894832669feeb85c6d2fa45f74152186f78
Reviewed-on: https://go-review.googlesource.com/c/pkgsite/+/260997
Reviewed-by: Jonathan Amsterdam <jba@google.com>
Reviewed-by: Julie Qiu <julie@golang.org>
Trust: Jonathan Amsterdam <jba@google.com>
Trust: Julie Qiu <julie@golang.org>
diff --git a/README.md b/README.md
index 2911c60..5995828 100644
--- a/README.md
+++ b/README.md
@@ -43,7 +43,7 @@
 ## Issues
 
 If you want to report a bug or have a feature suggestion, please first check
-the [known issues](https://github.com/golang/go/labels/go.dev) to see if your
+the [known issues](https://github.com/golang/go/labels/pkgsite) to see if your
 issue is already being discussed. If an issue does not already exist, feel free
 to [file an issue](https://golang.org/s/pkgsite-feedback).