====== Please remove the `platform` key ======

''Please remove the `platform` key from the [esphome] block and use the correct platform component.''

From:
<code yaml>
esphome:
  name: ${device_name}
  platform: ESP8266
  board: esp01_1m
</code>

change to:
<code yaml>
esphome:
  name: ${plug_name}

esp8266:
  board: esp01_1m
</code>