Fix Readme Error for setup local jaeger service (jaegertracing#265)

* Fix Readme error

* Fix readme to add ui-base-path

Signed-off-by: vvvprabhakar <vvvprabhakar@gmail.com>

README.md

@@ -44,9 +44,11 @@ Make sure you have the Jaeger Query service running on http://localhost:16686. F
 If you don't have it running locally, then tunnel to the correct host and port.
 
 ```
-ssh -fN -L 16686:$BACKEND_HOST:$BACKEND_PORT $BACKEND_PORT
+ssh -fN -L 16686:$BACKEND_HOST:$BACKEND_PORT $BACKEND_HOST
 ```
 
+If you are using [UI Base Path](https://www.jaegertracing.io/docs/1.7/deployment/#ui-base-path) feature, you need to append the base path into `proxy->/api->target` in package.json file. for example: if the base path is `"/jaeger"`, then the target should be `"http://localhost:16686/jaeger"`
+
 Start the development server with hot loading:
 
 ```