chore(cargo): add 'full' feature as shorthand (#18)

Author: seanmonstar

Cargo.toml

@@ -37,6 +37,9 @@ tokio = { version = "1", features = ["macros", "test-util"] }
 pnet_datalink = "0.27.2"
 
 [features]
+# Shorthand to enable everything
+full = ["http1", "http2", "tcp", "runtime"]
+
 runtime = []
 tcp = []
 http1 = []