Update dependencies

Author: eldruin

Cargo.toml

@@ -21,19 +21,19 @@ default = [ "gpio_cdev", "gpio_sysfs" ]
 
 [dependencies]
 embedded-hal = "=1.0.0-alpha.5"
-gpio-cdev = { version = "0.4", optional = true }
+gpio-cdev = { version = "0.5", optional = true }
 sysfs_gpio = { version = "0.5", optional = true }
 
-i2cdev = "0.4.3"
+i2cdev = "0.5"
 nb = "1"
 serial-core = "0.4.0"
 serial-unix = "0.4.0"
-spidev = "0.4"
+spidev = "0.5"
 
 [dev-dependencies]
 openpty = "0.1.0"
 
 [dependencies.cast]
 # we don't need the `Error` implementation
 default-features = false
-version = "0.2.2"
+version = "0.3"