Modernize the BLE permission on iOS

Author: microbit-matt-hillsdon

ios/App/App/Info.plist

@@ -4,8 +4,8 @@
 <dict>
 	<key>CFBundleDevelopmentRegion</key>
 	<string>en</string>
-	<key>NSBluetoothAlwaysUsageDescription</key>
-	<string>Uses Bluetooth to connect and interact with peripheral BLE devices.</string>
+	<key>NSBluetoothPeripheralUsageDescription</key>
+	<string>This app uses Bluetooth to connect to and communicate with your micro:bit.</string>
 	<key>UIBackgroundModes</key>
 	<array>
 		<string>bluetooth-central</string>