build(deps): bump structopt from 0.3.19 to 0.3.20

Bumps [structopt](https://github.com/TeXitoi/structopt) from 0.3.19 to 0.3.20.
- [Release notes](https://github.com/TeXitoi/structopt/releases)
- [Changelog](https://github.com/TeXitoi/structopt/blob/master/CHANGELOG.md)
- [Commits](https://github.com/TeXitoi/structopt/compare/v0.3.19...v0.3.20)

Signed-off-by: dependabot[bot] <support@github.com>

Cargo.lock

@@ -2507,9 +2507,9 @@ checksum = "6446ced80d6c486436db5c078dde11a9f73d42b57fb273121e160b84f63d894c"
 
 [[package]]
 name = "structopt"
-version = "0.3.19"
+version = "0.3.20"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a7a7159e7d0dbcab6f9c980d7971ef50f3ff5753081461eeda120d5974a4ee95"
+checksum = "126d630294ec449fae0b16f964e35bf3c74f940da9dca17ee9b905f7b3112eb8"
 dependencies = [
  "clap",
  "lazy_static",
@@ -2518,9 +2518,9 @@ dependencies = [
 
 [[package]]
 name = "structopt-derive"
-version = "0.4.12"
+version = "0.4.13"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8fc47de4dfba76248d1e9169ccff240eea2a4dc1e34e309b95b2393109b4b383"
+checksum = "65e51c492f9e23a220534971ff5afc14037289de430e3c83f9daf6a1b6ae91e8"
 dependencies = [
  "heck",
  "proc-macro-error",

zebra-utils/Cargo.toml

@@ -8,7 +8,7 @@ edition = "2018"
 publish = false
 
 [dependencies]
-structopt = "0.3.19"
+structopt = "0.3.20"
 color-eyre = "0.5.6"
 hex = "0.4"
 serde_json = "1.0"