Added event machine as a required Gem in the ReadMe

Author: plamoni

README.md

@@ -31,6 +31,7 @@ Currently, setup requires a pretty solid knowledge of certificates and openssl (
 	* json
 	* CFPropertyList
 	* uuidtools
+	* eventmachine
 5. Execute start.rb (as root -- since it must listen on TCP/443)
 6. Activate Siri on your phone (connected to the network and using the DNS server with the fake entry), and say, "Test Siri proxy." It should respond, "Siri Proxy is up and running!"