Bump uglifier from 4.1.1 to 4.1.8

[dependabot-preview[bot]]

Bumps uglifier from 4.1.1 to 4.1.8.

Changelog

*Sourced from uglifier's [changelog](https://github.com/lautis/uglifier/blob/master/CHANGELOG.md).* > ## 4.1.8 (14 March 2018) > > - update UglifyJS to [3.3.15](https://github.com/mishoo/UglifyJS2/compare/v3.3.14...v3.3.15) > > ## 4.1.7 (11 March 2018) > > - update UglifyJS to [3.3.14](https://github.com/mishoo/UglifyJS2/compare/v3.3.10...v3.3.14) > > ## 4.1.6 (08 February 2018) > > - update UglifyJS to [3.3.10](https://github.com/mishoo/UglifyJS2/compare/v3.3.9...v3.3.10) > - update uglify-es to [3.3.10](https://github.com/mishoo/UglifyJS2/compare/harmony-v3.3.9...harmony-v3.3.10) > > ## 4.1.5 (28 January 2018) > > - update UglifyJS to [3.3.9](https://github.com/mishoo/UglifyJS2/compare/v3.3.8...v3.3.9) > - update uglify-es to [3.3.9](https://github.com/mishoo/UglifyJS2/compare/harmony-v3.3.8...harmony-v3.3.9) > > ## 4.1.4 (22 January 2018) > > - update UglifyJS to [3.3.8](https://github.com/mishoo/UglifyJS2/compare/v3.3.5...v3.3.8) > - update uglify-es to [3.3.8](https://github.com/mishoo/UglifyJS2/compare/harmony-v3.3.5...harmony-v3.3.8) > > ## 4.1.3 (7 January 2018) > > - update UglifyJS to 3.3.5 > > ## 4.1.2 (30 December 2017) > > - update UglifyJS to 3.3.4

Commits

- [`8072269`](https://github.com/lautis/uglifier/commit/8072269a2b437441ae0eaf08a7f70671b99ffc4a) Bump version to 4.1.8 - [`b802550`](https://github.com/lautis/uglifier/commit/b802550951a0d1242af2278f7fc8df7ebffb124a) Update UglifyJS to 3.3.15 - [`fbfab11`](https://github.com/lautis/uglifier/commit/fbfab1106fc9527d41f89675077bba5c6252c9cc) Bump version to 4.1.7 - [`72aa83c`](https://github.com/lautis/uglifier/commit/72aa83c6749de5d1969fa7cb3a328883a5ece4a3) Fix unsafe_comps test - [`70e0906`](https://github.com/lautis/uglifier/commit/70e0906d2ca1d429b92d5c93a82faf1c1d407c00) Update UglifyJS to 3.3.14 - [`be95a41`](https://github.com/lautis/uglifier/commit/be95a4189c004cc1c628f1aaddd5403be40ce29f) Bump version to 4.1.6 - [`8d0cf31`](https://github.com/lautis/uglifier/commit/8d0cf314daf63f918175af6acf092323f9cae66a) Update UglifyJS to 3.3.10 - [`8a87a55`](https://github.com/lautis/uglifier/commit/8a87a5592586b2d9da99d432143219965b34ec0a) Bump version to 4.1.5 - [`26fabe3`](https://github.com/lautis/uglifier/commit/26fabe3bdfb53a8359302afd9917514bd925aa6c) Script to bump Uglifier version - [`48de580`](https://github.com/lautis/uglifier/commit/48de580db49b7022dfac0b03820bb9285e7fabdc) Update UglifyJS to 3.3.9 - Additional commits viewable in [compare view](https://github.com/lautis/uglifier/compare/v4.1.1...v4.1.8)

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[dependabot-preview[bot]]

Superseded by #1666.