Merge pull request #392 from Jigsaw-Code/doc-update

update readme instructions

Author: ohnorobo

x/examples/fetch-psiphon/README.md

@@ -5,7 +5,7 @@ This fetch tool illustrates how to use Psiphon as a stream dialer.
 Usage:
 
 ```sh
-go run github.com/Jigsaw-Code/outline-sdk/x/examples/fetch-psiphon@latest -config config.json https://ipinfo.io
+go run -tags psiphon github.com/Jigsaw-Code/outline-sdk/x/examples/fetch-psiphon@latest -config config.json https://ipinfo.io
 ```
 
 You will need a config file of a Psiphon server. You can run one yourself and generate the config as per the