Remove note of non-production firmware (#44)

Author: DCSBL

docs/endpoints/api-v1-data.mdx

@@ -199,10 +199,6 @@ Content-Length: <length>
 
 ## kWh Meters (1 and 3 phase)
 
-:::info New firmware version
-Firmware version 4.00 is currently in beta and will be available soon for everyone. You meter will automatically update to this version when it is available.
-:::
-
 Each type of meter is available in two versions. The API and functionality is the same for both types.
 
 -   **1-phase**: HWE-KWH1 and SDM230-wifi