Update to embedded-hal alpha.2

Author: eldruin

Cargo.toml

@@ -15,12 +15,12 @@ gpio_cdev = ["gpio-cdev"]
 default = [ "gpio_cdev", "gpio_sysfs" ]
 
 [dependencies]
-embedded-hal = "=1.0.0-alpha.1"
+embedded-hal = "=1.0.0-alpha.2"
 gpio-cdev = { version = "0.3", optional = true }
 sysfs_gpio = { version = "0.5", optional = true }
 
 i2cdev = "0.4.3"
-nb = "0.1.1"
+nb = "1"
 serial-core = "0.4.0"
 serial-unix = "0.4.0"
 spidev = "0.4"