stm32plus 4.0.2 released

[Andy Brown]

I've just released version 4.0.2 of stm32plus. This release collects together a number of bug fixes and small features that have been made since 4.0.0.

There was, briefly, a 4.0.1 release but since I forgot to update the build version number in stm32plus.h it was quickly abandoned so 4.0.2 is the latest release as of today.