[STM32L0] Cube driver release note

Go back to original html file found in the ST package. Finally the text
file is not practical. I will find another way to record the changes
made on this driver. Maybe an additional text file to add in the folder
?
Merge pull request #659 from toyowata/master

Platforms: WALLBOT_BLE - New platform addition
Merge pull request #657 from bcostm/master

Targets: STM32L0 - Cube driver release note