ESPHome OpenTherm Versions Save

• Fix PID updating: If temperature_sensor won't update frequently PID won't update its values (#31 @krzysztofsk)
• Use id(opentherm) to refer to custom component in example YAML (#33 @GMTA)
• Not keeping the pump running when the room thermostat had reached the target temperature (this could fix #35)

This fixes the compilation error: ESP8266WiFi.h: No such file or directory

First version of OpenThem integration with some bugs and many pending improvements. But functional for me ;-)

Thanks to the contribution of @fwestenberg

• Changed the pin settings according to the ihormelnyk and diyless adapter manual
• Bump to the latest opentherm version
• Support new ESPHome version, the set_supports_auto_mode is replaced by set_supports_heat_cool_mode. Otherwise it will not be connecting to Home Assistant anymore.
• Restore the climate settings
• Update the readme