fix method_missing not having the correct signature

[fruwe]

While I was trying to run to_yaml on a hash containing an appium element, an error was raised,
since the class is missing a encode_with method.

Since the method_missing method itself has the wrong signature, it failed actually with wrong number of arguments.

This PR fixes the signature of method_missing inside patch.rb

FYI I ended up adding encode_with as well:

def encode_with coder
  coder['name'] = name
end

[jsf-clabot]

All committers have signed the CLA.

[KazuCocoa]

i see. thanks!

[KazuCocoa]

https://github.com/appium/ruby_lib_core/releases/tag/v2.3.3

[fruwe]

thanks