Update dependency terser-webpack-plugin to v1.3.0

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change	References
terser-webpack-plugin	dependencies	minor	1.2.4 -> 1.3.0	source

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Release Notes

webpack-contrib/terser-webpack-plugin

### [`v1.3.0`](https://togithub.com/webpack-contrib/terser-webpack-plugin/blob/master/CHANGELOG.md#​130httpsgithubcomwebpack-contribterser-webpack-plugincomparev124v130-2019-05-24) [Compare Source](https://togithub.com/webpack-contrib/terser-webpack-plugin/compare/v1.2.4...v1.3.0) ##### Features - update terser to 4 version ([#​97](https://togithub.com/webpack-contrib/terser-webpack-plugin/issues/97)) ([15d1595](https://togithub.com/webpack-contrib/terser-webpack-plugin/commit/15d1595)) ##### [1.2.4](https://togithub.com/webpack-contrib/terser-webpack-plugin/compare/v1.2.3...v1.2.4) (2019-05-15) ##### Bug Fixes - disable parallel on WSL due bugs ([#​90](https://togithub.com/webpack-contrib/terser-webpack-plugin/issues/90)) ([d9533dd](https://togithub.com/webpack-contrib/terser-webpack-plugin/commit/d9533dd)) - fallback for cache directory ([#​86](https://togithub.com/webpack-contrib/terser-webpack-plugin/issues/86)) ([3cdd2ed](https://togithub.com/webpack-contrib/terser-webpack-plugin/commit/3cdd2ed))

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