Update spidev dependencies

Author: iicurtis

Cargo.toml

@@ -10,9 +10,9 @@ version = "0.2.2"
 
 [dependencies]
 embedded-hal = { version = "0.2.0", features = ["unproven"] }
-i2cdev = "0.4.1"
-spidev = "0.3.0"
-sysfs_gpio = "0.5.1"
+i2cdev = "0.4"
+spidev = "0.4"
+sysfs_gpio = "0.5"
 serial-unix = "0.4.0"
 serial-core = "0.4.0"
 nb = "0.1.1"