Update readme.md

Author: bootstraponline

readme.md

@@ -51,6 +51,7 @@ Appium::Driver.new(apk).start_driver
 # Define the methods on all objects.
 # Note that this can also be scoped to limit the potential for conflicts.
 # Example: Appium.promote_appium_methods ::Minitest::Spec
+# Another alternative is to not promote at all. Instead access methods via $driver
 Appium.promote_appium_methods Object
 ```