fix uptime device_class hass logs error (#177)

add device class for wifi_signal (#176)

clean prints when sending via hass api (#173)

Update display (#168)

Update display (-d) function so no empty values are displayed

improve updater so new python modules are auto installed (#167)

fix syntax error

Rename uptime_days to uptime and make it a timestamp (#164)

fix f-string delimiters in publish_to_hass_api (#161)

Support for Home Assistant API (no MQTT needed) Experimental feature (#…

…160)

External sensors (#153)

* proof of principle, a DS18B20 is read and its value is transferred via MQTT, also discovery message works

* added names for ext sensors

* bugfix for names: there was a problem with the topics & added SHT21 support

* catch exceptions if a problem during readout occurs, shrink comments in config-file

* include ext_sensors in README file

* work in progress

* bugfix, also for ID of ds18b20 sensor

* Revert "bugfix, also for ID of ds18b20 sensor"

This reverts commit 1353b84.

file was intended for another branch

* Revert "work in progress"

This reverts commit b3e884f.

these changes were intended for another branch

* bugfix for ID of ds18b20 sensor