Bump version

Author: eldruin

Cargo.toml

@@ -9,7 +9,7 @@ keywords = ["Linux", "hal"]
 license = "MIT OR Apache-2.0"
 name = "linux-embedded-hal"
 repository = "https://github.com/rust-embedded/linux-embedded-hal"
-version = "0.4.0-alpha.3"
+version = "0.4.0-alpha.4"
 edition = "2018"
 
 [features]