add packages to example/chat

Author: miketheprogrammer

examples/chat/README.md

@@ -5,6 +5,11 @@ This example uses https://github.com/nsf/bin2go to embed assets. To
 make sure it's installed, run
 
     go get github.com/nsf/bin2go
+    
+Other neccessary packages
+
+    go get -v github.com/gorilla/websocket
+    go get -v github.com/tv42/birpc
 
 and put the resulting bin2go in `PATH`.