chore: bump github.com/alecthomas/kong from 0.2.19 to 0.2.20

Bumps [github.com/alecthomas/kong](https://github.com/alecthomas/kong) from 0.2.19 to 0.2.20.
- [Release notes](https://github.com/alecthomas/kong/releases)
- [Commits](alecthomas/kong@v0.2.19...v0.2.20)

---
updated-dependencies:
- dependency-name: github.com/alecthomas/kong
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

go.mod

@@ -3,7 +3,7 @@ module github.com/smlx/piv-agent
 go 1.15
 
 require (
-	github.com/alecthomas/kong v0.2.19
+	github.com/alecthomas/kong v0.2.20
 	github.com/coreos/go-systemd v0.0.0-20191104093116-d3cd4ed1dbcf
 	github.com/davecgh/go-spew v1.1.1
 	github.com/gen2brain/beeep v0.0.0-20200526185328-e9c15c258e28

go.sum

@@ -1,7 +1,7 @@
 filippo.io/age v1.0.0-beta4/go.mod h1:TOa3exZvzRCLfjmbJGsqwSQ0HtWjJfTTCQnQsNCC4E0=
 github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
-github.com/alecthomas/kong v0.2.19 h1:qBDfByO5XgWUXyNB4D6OOhGh5Z1eNOwWayDPQJFNWdc=
-github.com/alecthomas/kong v0.2.19/go.mod h1:ka3VZ8GZNPXv9Ov+j4YNLkI8mTuhXyr/0ktSlqIydQQ=
+github.com/alecthomas/kong v0.2.20 h1:j8icvBJGdkkvv4lZ8rWN9MF5Z9DWBEmQrjZ69Z8XFwM=
+github.com/alecthomas/kong v0.2.20/go.mod h1:ka3VZ8GZNPXv9Ov+j4YNLkI8mTuhXyr/0ktSlqIydQQ=
 github.com/atotto/clipboard v0.1.2/go.mod h1:ZY9tmq7sm5xIbd9bOK4onWV4S6X0u6GY7Vn0Yu86PYI=
 github.com/atotto/clipboard v0.1.2/go.mod h1:ZY9tmq7sm5xIbd9bOK4onWV4S6X0u6GY7Vn0Yu86PYI=
 github.com/benbjohnson/clock v1.1.0 h1:Q92kusRqC1XV2MjkWETPvjJVqKetz1OzxZB7mHJLju8=