Fix the rt feature for stm32h7 0.14.0

The stm32h7 crate includes 'rt' as a default feature for 0.14.0.

Author: newAM

Cargo.toml

@@ -28,7 +28,7 @@ targets = ["thumbv7em-none-eabihf"]
 embedded-hal = "0.2.6"
 embedded-dma = "0.1.2"
 cortex-m = "^0.7.1"
-stm32h7 = "^0.14.0"
+stm32h7 = { version = "^0.14.0", default-features = false }
 void = { version = "1.0.2", default-features = false }
 cast = { version = "0.3.0", default-features = false }
 nb = "1.0.0"