migrate from structopt to clap

Author: syphar

Cargo.lock

@@ -28,7 +28,7 @@ tracing = "0.1.37"
 tracing-subscriber = { version = "0.3.16", default-features = false, features = ["ansi", "fmt", "env-filter"] }
 tracing-log = "0.1.3"
 regex = "1"
-structopt = "0.3"
+clap = { version = "4.0.22", features = [ "derive" ] }
 crates-index = { version = "0.18.5", optional = true }
 rayon = { version = "1", optional = true }
 crates-index-diff = "10.0.0"