chore(mtu): prepare v0.3.0 release (#3286)

Author: mxinden

Cargo.lock

@@ -3,7 +3,7 @@ name = "mtu"
 authors.workspace = true
 homepage.workspace = true
 repository.workspace = true
-version = "0.2.9"
+version = "0.3.0"
 edition = "2021"
 rust-version.workspace = true
 license.workspace = true