Merge rust-embedded#14

14: Bump i2cdev version r=therealprof a=ryankurte

rust-i2cdev has a new minor version that removes a pile of dependencies (and speeds up builds measurably), see: rust-embedded/rust-i2cdev#47

This PR bumps i2cdev to the updated version and adds a missing newline to the end of cargo.toml

Co-authored-by: Ryan Kurte <ryankurte@gmail.com>

Cargo.toml

@@ -10,11 +10,11 @@ version = "0.2.1"
 
 [dependencies]
 embedded-hal = { version = "0.2.0", features = ["unproven"] }
-i2cdev = "0.3.1"
+i2cdev = "0.4.1"
 spidev = "0.3.0"
 sysfs_gpio = "0.5.1"
 
 [dependencies.cast]
 # we don't need the `Error` implementation
 default-features = false
-version = "0.2.2"
+version = "0.2.2"