Enable derive on Clap

This let's us use the derive feature.

Cargo.lock

@@ -230,6 +230,8 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "401a4694d2bf92537b6867d94de48c4842089645fdcdf6c71865b175d836e9c2"
 dependencies = [
  "clap_builder",
+ "clap_derive",
+ "once_cell",
 ]
 
 [[package]]
@@ -245,6 +247,18 @@ dependencies = [
  "strsim",
 ]
 
+[[package]]
+name = "clap_derive"
+version = "4.3.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b8cd2b2a819ad6eec39e8f1d6b53001af1e5469f8c177579cdaeb313115b825f"
+dependencies = [
+ "heck",
+ "proc-macro2",
+ "quote",
+ "syn 2.0.15",
+]
+
 [[package]]
 name = "clap_lex"
 version = "0.5.0"
@@ -512,6 +526,12 @@ version = "0.12.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8a9ee70c43aaf417c914396645a0fa852624801b24ebb7ae78fe8272889ac888"
 
+[[package]]
+name = "heck"
+version = "0.4.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "95505c38b4572b2d910cecb0281560f54b440a19336cbbcb27bf6ce6adc6f5a8"
+
 [[package]]
 name = "hermit-abi"
 version = "0.3.1"

burrow/Cargo.toml

@@ -9,4 +9,4 @@ crate-type = ["lib", "staticlib"]
 [dependencies]
 tokio = { version = "1.21", features = ["rt", "macros"] }
 tun = { version = "0.1", path = "../tun" }
-clap = "4.3.2"
+clap = { version = "4.3.2", features = ["derive"] }