Bump uglifier from 4.1.3 to 4.1.4
Bump uglifier from 4.1.3 to 4.1.4

Bumps [uglifier](https://github.com/lautis/uglifier) from 4.1.3 to 4.1.4.
- [Changelog](https://github.com/lautis/uglifier/blob/master/CHANGELOG.md)
- [Commits](https://github.com/lautis/uglifier/compare/v4.1.3...v4.1.4)
alphagov/signonotron2,alphagov/signonotron2,alphagov/signonotron2,alphagov/signonotron2