chore(deps): update dependency @fullhuman/postcss-purgecss to v1.3.0

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
@fullhuman/postcss-purgecss	devDependencies	minor	1.2.0 -> 1.3.0

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Release Notes

FullHuman/postcss-purgecss

### [`v1.3.0`](https://togithub.com/FullHuman/postcss-purgecss/blob/master/CHANGELOG.md#v130---2019-09-13) [Compare Source](https://togithub.com/FullHuman/postcss-purgecss/compare/f9c8bad39c84c791bfc354271326f1e981b61019...1.3.0) - Update dependencies, including PurgeCSS 1.4

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