README: Update to include WL series support.

Signed-off-by: Damien George <[email protected]>

Author: dpgeorge

README.md

@@ -1,10 +1,11 @@
-STM32 Cube library - CMSIS and HAL for F0, F4, F7, G4, H7, L0, L4 and WB microcontrollers
-=========================================================================================
+STM32 Cube library - CMSIS and HAL for F0, F4, F7, G4, H7, L0, L4, WB and WL microcontrollers
+=============================================================================================
 
 This repository contains a copy of STMicroelectronic's STM32 Cube firmware
-library, with CMSIS-device and HAL code for STM32F0xx, STM32F4xx, STM32F7xx, STM32G4xx,
-STM32H7xx, STM32L0xx, STM32L4xx and STM32WBxx microcontrollers.  Minor changes
-are applied to the HAL source to support MicroPython's port to the STM32.
+library, with CMSIS-device and HAL code for STM32F0xx, STM32F4xx, STM32F7xx,
+STM32G4xx, STM32H7xx, STM32L0xx, STM32L4xx, STM32WBxx and STM32WLxx
+microcontrollers.  Minor changes are applied to the HAL source to support
+MicroPython's port to the STM32.
 
 The "vendor" branch contains the original sources and is updated from
 time-to-time when new versions become available.  The upstream sources are