README: point to Uber's fork
golang/mock is no longer maintained.
Point to uber/mock instead.
Fixes golang/go#61017.
diff --git a/README.md b/README.md
index a4213e5..6ad2952 100644
--- a/README.md
+++ b/README.md
@@ -1,5 +1,8 @@
# gomock
+**Update, June 2023**: _This repo and tool are no longer maintained.
+Please see [go.uber.org/mock](https://github.com/uber/mock) for a maintained fork instead._
+
[![Build Status][ci-badge]][ci-runs] [![Go Reference][reference-badge]][reference]
gomock is a mocking framework for the [Go programming language][golang]. It
