chore: version bump

Signed-off-by: Sergei Trofimov <sergei.trofimov@arm.com>

Author: setrofim

Cargo.toml

@@ -1,7 +1,7 @@
 [package]
 name = "ear"
 description = "EAT Attestation Results implementation"
-version = "0.3.0"
+version = "0.4.0"
 edition = "2021"
 repository = "https://github.com/veraison/rust-ear"
 readme = "README.md"