Update Readme

Author: eldruin

README.md

@@ -13,9 +13,6 @@ This project is developed and maintained by the [Embedded Linux team][team].
 
 ## [Documentation](https://docs.rs/linux-embedded-hal)
 
-Note that current `v0.4.0-alpha.X` releases track the unstable ['embedded-hal'] `v1.0.0-alpha.Y`.
-For bugfixes or backports please open PRs against the `v0.3.x` branch.
-
 ## GPIO character device
 
 Since Linux kernel v4.4 the use of sysfs GPIO was deprecated and replaced by the character device GPIO.
@@ -25,7 +22,7 @@ This crate includes feature flag `gpio_cdev` that exposes `CdevPin` as wrapper a
 To enable it update your Cargo.toml. Please note that in order to prevent `LineHandle` fd from closing you should
 assign to a variable, see [cdev issue](https://github.com/rust-embedded/gpio-cdev/issues/29) for more details.
 ```
-linux-embedded-hal = { version = "0.3", features = ["gpio_cdev"] }
+linux-embedded-hal = { version = "0.4", features = ["gpio_cdev"] }
 ```
 
 `SysfsPin` can be still used with feature flag `gpio_sysfs`.