README: Update to include F0 series support.

Author: dpgeorge

README.md

@@ -1,10 +1,10 @@
-STM32 Cube library - CMSIS and HAL for F4, F7, H7 and L4 microcontrollers
-=========================================================================
+STM32 Cube library - CMSIS and HAL for F0, F4, F7, H7 and L4 microcontrollers
+=============================================================================
 
 This repository contains a copy of STMicroelectronic's STM32 Cube firmware
-library, with CMSIS-device and HAL code for STM32F4xx, STM32F7xx, STM32H7xx
-and STM32L4xx 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,
+STM32H7xx and STM32L4xx 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