Update README.md

Change code status after a sustained testing.

README.md

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 # Domoticz TP-Link TAPO P100 Integration
 This plugin provides basic control of TP-Link Tapo P100 devices, with firmware from 2023 onwards, from Domoticz.
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-Author: RandomOutcome | Status: Pre-Release
+Author: RandomOutcome | Status: Beta Release
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 ### Domoticz plugin for Tapo P100 control, for Tapo devices with firmware upgrade in 2023 that changed the device communication protocol breaking earlier plugins