README update

Author: Carglglz

README.md

@@ -40,7 +40,7 @@ This requires [WebREPL](http://docs.micropython.org/en/latest/esp8266/tutorial/r
 
 ### BLE DEVICE (BleREPL Protocol): `BLE_DEVICE`
 
-This requires [BleREPL](https://github.com/Carglglz/upyble#getting-started) to be enabled in the device.
+This requires [BleREPL](https://github.com/Carglglz/upyble#getting-started) to be enabled in the device. (This is experimental, only tested on MacOS)
 
 ```
 >>> from upydevice import BLE_DEVICE

changelog.md

@@ -4,7 +4,7 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html)
 
-## [0.2.4] [Github repo]
+## [0.2.4] Unreleased [Github repo]
 ### Added
 - `BLE_DEVICE` for bluetooth low energy devices
 ## [0.2.3] - 2020-05-25