Update dependency bourbon-neat to v4

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
bourbon-neat (source)	1.9.1 -> 4.0.0

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Release Notes

thoughtbot/neat (bourbon-neat)

### [`v4.0.0`](https://togithub.com/thoughtbot/neat/blob/HEAD/CHANGELOG.md#400---2019-07-10) [Compare Source](https://togithub.com/thoughtbot/neat/compare/v3.0.1...v4.0.0) ##### Removed - Installation through Bower is no longer supported. - The sass gem (the deprecated Ruby Sass) is no longer a runtime dependency. ### [`v3.0.1`](https://togithub.com/thoughtbot/neat/blob/HEAD/CHANGELOG.md#301---2019-01-07) [Compare Source](https://togithub.com/thoughtbot/neat/compare/v3.0.0...v3.0.1) ##### Fixed - Fixed an issue that would cause Neat to not be found when using SassC. - Fixed `if` function syntax error. ### [`v3.0.0`](https://togithub.com/thoughtbot/neat/blob/HEAD/CHANGELOG.md#300---2018-06-29) [Compare Source](https://togithub.com/thoughtbot/neat/compare/v2.1.0...v3.0.0) - Extend grid-media to accept multiple custom grids ### [`v2.1.0`](https://togithub.com/thoughtbot/neat/blob/HEAD/CHANGELOG.md#210---2017-06-27) [Compare Source](https://togithub.com/thoughtbot/neat/compare/v2.0.0...v2.1.0) ##### Added - A `--path` CLI option, which lets you install Neat into specific directory. ([#​459]) - A `style` property has been added to our `package.json`, which makes for easy importing when using npm-sass, sass-module-importer and others. ([#​514]) ##### Fixed - Fixed an issue that would cause Neat to not be found within Rails apps. ([#​612]) - Simplified the gradient used in the `grid-visual` mixin for more consistent cross-browser behaviour. ([#​569]) [#​459]: https://togithub.com/thoughtbot/neat/pull/459 [#​514]: https://togithub.com/thoughtbot/neat/pull/514 [#​569]: https://togithub.com/thoughtbot/neat/pull/569 [#​612]: https://togithub.com/thoughtbot/neat/pull/612 ### [`v2.0.0`](https://togithub.com/thoughtbot/neat/blob/HEAD/CHANGELOG.md#200---2017-02-17) [Compare Source](https://togithub.com/thoughtbot/neat/compare/v1.9.1...v2.0.0) ##### Fixed - Custom grids inherit undefined properties from global `$neat-grid` - Fixed instillation from CLI - Remove float property from `grid-collapse`

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