Cargo Features

drogue-grove-uart-spi has no features set by default.

[dependencies]
drogue-grove-uart-spi = { version = "0.1.0", features = ["stm32f4xx", "stm32f7xx", "dump"] }
stm32f4xx
stm32f7xx
dump

drogue-grove-uart-spi has 3 features without comments.