readme.md in appium_lib-0.3.1 vs readme.md in appium_lib-0.3.2

@@ -31,9 +31,11 @@
 
 # Start a driver based on APP_PATH
 Appium::Driver.new.start_driver
 
 # Start an Android driver
+# must quit old driver before starting a new one
+driver_quit
 apk = { 'APP_PATH' => ENV['APP_APK'] }
 Appium::Driver.new(apk).start_driver
 ```
 
 #### Documentation