Does not support EP40: Outside outlet device with two switched outlets.

[dwilliams459]

Thanks for this repo! It does not seem to work with the outside plug EP40 with two switches. Refer to the draft pull request to see my attempt to get this to work. Documentation found https://community.home-assistant.io/t/tp-link-kasa-kp400-2-outlet-support/113135/9 suggests adding a 'context' node like:
{"system":{"set_relay_state":{"state":0}},"context":{"child_ids":["000000000000000000000000"]}}.
This did not seem to work for me, however it may be close to the correct solution.
Draft PR: #10
I have not tried lostmsu's power strip solution in from PR #3.