Merge #151

151: Update cast from 0.2 to 0.3 r=therealprof a=newAM

`cast` changelog: [CHANGELOG.md](https://github.com/japaric/cast.rs/blob/v0.3.0/CHANGELOG.md#v030---2021-09-04)


Co-authored-by: Alex Martens <alex@thinglab.org>

Author: bors[bot]

CHANGELOG.md

@@ -7,6 +7,10 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 
 ## [Unreleased]
 
+### Changed
+
+- Updated the `cast` dependency from 0.2 to 0.3
+
 ### Fixed
 
 - Wrong mode when using PWM channel 2 of a two-channel timer

Cargo.toml

@@ -31,7 +31,7 @@ targets = ["thumbv6m-none-eabi"]
 
 [dependencies]
 bare-metal = { version = "1.0.0" }
-cast = { version = "0.2", default-features = false }
+cast = "0.3"
 cortex-m = "0.7"
 embedded-hal = { version = "0.2", features = ["unproven"] }
 stm32f0 = "0.14"