Update CHANGELOG

CHANGELOG.md

@@ -4,6 +4,29 @@ 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/).
 
 ## [Unreleased]
+### Added
+- `leds.flash_rocket()` API for making rockets flash asynchronously.
+- Basic API for the MAX86150 pulse-oximeter.
+- A feature to allow setting the main app on-device.
+- Added compatibility to BLE 5.0 capable phones (including iPhones).
+- Added pairing dialog in BLE app. Device is only visible when BLE app is
+  active.
+- Option to write HCI layer log files for debugging.
+- _Stub_ `ubluetooth` module.  Not yet functional!
+
+
+### Changed
+- Internal changes to the way interrupts are triggered.
+- Updated to a newer version of MicryPython (v1.12).
+- Improved BLE security by only allowing man-in-the-middle protected
+  pairings and specifying minimum key lengths.
+
+### Fixed
+- Made the `vibra` vibration motor API more stable.
+- Fixed bug which triggered reboot loops.
+- Fixed bug which made the USB serial connection unresponsive.
+- Fixed bug which wrote the pairings file more periodically.
+- Fixed invalid filesystem locking in BLE startup.
 
 
 ## [v1.15] - 2020-02-02 - [Okra]