message: Update README.md
  fixes tunnel command line example
diff: @@ -222,7 +222,7 @@ All parameters are the same as Socks5 client, except `--protocol http`.
  ```bash
  # Read local client configuration from file
  # Set 127.0.0.1:8080 as the target for forwarding to
  -sslocal --protocol tunnel -b "127.0.0.1:3128" --protocol tunnel -f "127.0.0.1:8080" -s "[::1]:8388" -m "aes-256-gcm" -k "hello-kitty"
  +sslocal --protocol tunnel -b "127.0.0.1:3128" -f "127.0.0.1:8080" -s "[::1]:8388" -m "aes-256-gcm" -k "hello-kitty"
  ```
  * `--protocol tunnel` enables local client Tunnel mode
  