Update README.md

Updated pi compatibility statement.

README.md

@@ -7,9 +7,7 @@
 RTL-SDR UAT tools
 
 
-Use with Raspberry Pi 3B. Do **not** use with the Raspberry Pi 3 _**B+**_.
-
-Raspberry Pi 2 with the Edimax EW-7811Un Wi-Fi dongle is supported but not recommended for new builds.
+Use with Raspberry Pi 3B. The 3bb+ and Pi 4B will work but use a lot more power.
 
 Tested and works well with most common R820T and R820T2 RTL-SDR devices.