Add comment about what to do if you use an F030.

The obvious change doesn't work!

Author: thejpster

Cargo.toml

@@ -14,6 +14,9 @@ defmt = "0.2.0"
 defmt-rtt = "0.2.0"
 cortex-m-rtic = "0.5"
 panic-probe = { version = "0.2.0", features = ["print-defmt"] }
+# Use this line if you have an STM32F030K6T6
+# stm32f0xx-hal = { version = "0.17", features = ["stm32f030x6", "rt"] }
+# Use this line if you have an STM32F031K6T6
 stm32f0xx-hal = { version = "0.17", features = ["stm32f031", "rt"] }
 debouncr = "0.2"