build(deps): bump github.com/urfave/cli from 1.21.0 to 1.22.1 (#6015)

Bumps [github.com/urfave/cli](https://github.com/urfave/cli) from 1.21.0 to 1.22.1.
- [Release notes](https://github.com/urfave/cli/releases)
- [Changelog](https://github.com/urfave/cli/blob/master/CHANGELOG.md)
- [Commits](https://github.com/urfave/cli/compare/v1.21.0...v1.22.1)

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

go.mod

@@ -41,7 +41,7 @@ require (
 	github.com/syncthing/notify v0.0.0-20190709140112-69c7a957d3e2
 	github.com/syndtr/goleveldb v1.0.1-0.20190318030020-c3a204f8e965
 	github.com/thejerf/suture v3.0.2+incompatible
-	github.com/urfave/cli v1.21.0
+	github.com/urfave/cli v1.22.1
 	github.com/vitrun/qart v0.0.0-20160531060029-bf64b92db6b0
 	golang.org/x/crypto v0.0.0-20190829043050-9756ffdc2472
 	golang.org/x/net v0.0.0-20190827160401-ba9fcec4b297