cargo: relax dependency on url

It turns out that we can use version 1.x, not just 1.5.1 and later.
Tested with

  % cargo update -p url --precise 1.0.0
  % cargo test

Author: mgeisler

Cargo.toml

@@ -26,6 +26,6 @@ semver-parser = "0.9"
 syn = { version = "0.15", features = ["full"] }
 proc-macro2 = { version = "0.4", features = ["span-locations"] }
 toml = "0.5"
-url = "1.5.1"
+url = "1.0"
 itertools = "0.8"
 regex = "1.1"