stm32f30x-hal

stm32f30x-hal is used at run time in 1 crate. It's used only as a dev dependency in 2 crates.

Depender (with downloads and own rev deps)			stm32f30x-hal version
190	1	f3		^0.2.0
		hts221	dev	^0.2.0
	1	serialio	dev	^0.2.0