tlsrouter/README: fix the go get url

Fixes inetaf#19

Signed-off-by: Vincent Batts <vbatts@hashbangbash.com>

Author: vbatts

cmd/tlsrouter/README.md

@@ -11,7 +11,7 @@ This is not an official Google project.
 Install TLSRouter via `go get`:
 
 ```shell
-go get go.universe.tf/tlsrouter
+go get go.universe.tf/tcpproxy/cmd/tlsrouter
 ```
 
 ## Usage