Update README.md
Emphasis on passivity
-# Xiaomi BLE Monitor sensor platform
+# Xiaomi passive BLE Monitor sensor platform
This custom component is an alternative for the standard build in [mitemp_bt](https://www.home-assistant.io/integrations/mitemp_bt/) integration that is available in Home Assistant. Unlike the original `mitemp_bt` integration, which is getting its data by polling the device with a default five-minute interval, this custom component is parsing the Bluetooth Low Energy packets payload that is constantly emitted by the sensor. The packets payload may contain temperature/humidity/battery and other data. Advantage of this integration is that it doesn't affect the battery as much as the built-in integration. It also solves connection issues some people have with the standard integration (due to passivity and the ability to collect data from multiple bt-interfaces simultaneously).
