git-codereview: fix how to install the command

Change-Id: Iaa78b677af114d3e6ec48855aa8d5459e4f979ef
Reviewed-on: https://go-review.googlesource.com/c/review/+/399314
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Kevin Burke <kevin@burke.dev>
Reviewed-by: Ian Lance Taylor <iant@google.com>
Run-TryBot: Ian Lance Taylor <iant@google.com>
Auto-Submit: Ian Lance Taylor <iant@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Russ Cox <rsc@golang.org>
diff --git a/README.md b/README.md
index 8588768..c17c0fa 100644
--- a/README.md
+++ b/README.md
@@ -4,7 +4,7 @@
 
 ## Download/Install
 
-The easiest way to install is to run `go get -u golang.org/x/review/git-codereview`. You can
+The easiest way to install is to run `go install golang.org/x/review/git-codereview@latest`. You can
 also manually git clone the repository to `$GOPATH/src/golang.org/x/review`.
 
 Run `git codereview hooks` to install Gerrit hooks for your git repository.