Mqtt-io

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- Multi-versioned documentation.
- Auto-reconnect to MQTT server on disconnection. 207 fipwmaqzufheoxq92ebc

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- Fix broken hcsr04 sensor that I (flyte) broke when rewriting for v2.x. 211 r00tat
- Fix inversion not taken into account when publishing initial digital output value. 203 r00tat
- Fix 198 where Future wasn't created from the right thread. 205 fipwmaqzufheoxq92ebc

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- Add install_requirements config option to skip installing missing module requirements. 199

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- Add ADS1x15 module. 200 r00tat

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- Update PyYAML version to 5.4 CVE-2020-14343

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- Add version to 'model' field of HA Discovery config payload. 196 pbill2003