Add self update functionality

Signed-off-by: Jacob Kiers <code@kiers.eu>

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "l4p"
-version = "0.1.8"
+version = "0.1.9"
 edition = "2021"
 authors = ["Jacob Kiers <code@kiers.eu>"]
 license = "Apache-2.0"
@@ -25,6 +25,7 @@ byte_string = "1"
 bytes = "1.1"
 futures = "0.3"
 log = "0.4"
+pico-args = "0.5.0"
 pretty_env_logger = "0.5"
 serde = { version = "1.0", features = ["derive"] }
 serde_yaml = "0.9.21"
@@ -32,3 +33,8 @@ time = { version = "0.3.1", features = ["local-offset", "formatting"] }
 tls-parser = "0.11"
 tokio = { version = "1.0", features = ["full"] }
 url = "2.2.2"
+
+[dependencies.self_update]
+version = "0.40.0"
+default-features = false
+features = ["rustls"]