Bump lint-staged from 7.2.0 to 8.0.4 (#267)

Bumps [lint-staged](/~https://github.com/okonet/lint-staged) from 7.2.0 to 8.0.4.
<details>
<summary>Release notes</summary>

*Sourced from [lint-staged's releases](/~https://github.com/okonet/lint-staged/releases).*

> ## v8.0.4
> ## [8.0.4](http://git+https/github.com/okonet/lint-staged/compare/v8.0.3...v8.0.4) (2018-10-31)
> 
> 
> ### Bug Fixes
> 
> * **package:** update staged-git-files to version 1.1.2 ([ce434d3](http://git+https/github.com/okonet/lint-staged/commit/ce434d3))
> 
> ## v8.0.3
> ## [8.0.3](http://git+https/github.com/okonet/lint-staged/compare/v8.0.2...v8.0.3) (2018-10-30)
> 
> 
> ### Bug Fixes
> 
> * Allow to use lint-staged on CI ([#523](http://git+https/github-redirect.dependabot.com/lint-staged/lint-staged/issues/523)) ([225a904](http://git+https/github.com/okonet/lint-staged/commit/225a904))
> 
> ## v8.0.2
> ## [8.0.2](http://git+https/github.com/okonet/lint-staged/compare/v8.0.1...v8.0.2) (2018-10-29)
> 
> 
> ### Bug Fixes
> 
> * **git:** Use resolveGitDir in hasPartiallyStagedFiles ([#520](http://git+https/github-redirect.dependabot.com/lint-staged/lint-staged/issues/520)) ([af99172](http://git+https/github.com/okonet/lint-staged/commit/af99172)), closes [#514](http://git+https/github-redirect.dependabot.com/lint-staged/lint-staged/issues/514)
> 
> ## v8.0.1
> ## [8.0.1](http://git+https/github.com/okonet/lint-staged/compare/v8.0.0...v8.0.1) (2018-10-29)
> 
> 
> ### Bug Fixes
> 
> * **git:** Use resolveGitDir to resolve to .git for git commands ([#518](http://git+https/github-redirect.dependabot.com/lint-staged/lint-staged/issues/518)) ([da42f8a](http://git+https/github.com/okonet/lint-staged/commit/da42f8a)), closes [#514](http://git+https/github-redirect.dependabot.com/lint-staged/lint-staged/issues/514)
> 
> ## v8.0.0
> # [8.0.0](http://git+https/github.com/okonet/lint-staged/compare/v7.3.0...v8.0.0) (2018-10-29)
> 
> 
> ### Features
> 
> * Add support for partially staged files ([#75](http://git+https/github-redirect.dependabot.com/lint-staged/lint-staged/issues/75)) ([f82443c](http://git+https/github.com/okonet/lint-staged/commit/f82443c)), closes [#62](http://git+https/github-redirect.dependabot.com/lint-staged/lint-staged/issues/62)
> 
> 
> ### BREAKING CHANGES
> 
> * Node >= 8.6 is required
> 
> ## v7.4.0
> # [7.4.0](http://git+https/github.com/okonet/lint-staged/compare/v7.3.0...v7.4.0) (2018-10-29)
> 
> 
> ### Features
></table> ... (truncated)
</details>
<details>
<summary>Commits</summary>

- [`5e165a3`](lint-staged/lint-staged@5e165a3) Merge pull request [#513](https://github-redirect.dependabot.com/okonet/lint-staged/issues/513) from okonet/greenkeeper/staged-git-files-1.1.2
- [`07fd087`](lint-staged/lint-staged@07fd087) Merge branch 'master' into greenkeeper/staged-git-files-1.1.2
- [`00047de`](lint-staged/lint-staged@00047de) docs: fix typo ([#527](https://github-redirect.dependabot.com/okonet/lint-staged/issues/527))
- [`bedba5a`](lint-staged/lint-staged@bedba5a) refactor: Use object spread ([#524](https://github-redirect.dependabot.com/okonet/lint-staged/issues/524))
- [`225a904`](lint-staged/lint-staged@225a904) fix: Allow to use lint-staged on CI ([#523](https://github-redirect.dependabot.com/okonet/lint-staged/issues/523))
- [`af99172`](lint-staged/lint-staged@af99172) fix(git): Use resolveGitDir in hasPartiallyStagedFiles ([#520](https://github-redirect.dependabot.com/okonet/lint-staged/issues/520))
- [`da42f8a`](lint-staged/lint-staged@da42f8a) fix(git): Use resolveGitDir to resolve to .git for git commands ([#518](https://github-redirect.dependabot.com/okonet/lint-staged/issues/518))
- [`c4e8a2d`](lint-staged/lint-staged@c4e8a2d) chore(package): update lockfile yarn.lock
- [`ce434d3`](lint-staged/lint-staged@ce434d3) fix(package): update staged-git-files to version 1.1.2
- [`592486f`](lint-staged/lint-staged@592486f) docs: Update readme to include info about partially staged files support
- Additional commits viewable in [compare view](lint-staged/lint-staged@v7.2.0...v8.0.4)
</details>
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package.json

@@ -32,7 +32,7 @@
     "gulp-zip": "4.1.0",
     "husky": "1.1.0",
     "less": "2.7.3",
-    "lint-staged": "7.2.0",
+    "lint-staged": "8.0.4",
     "main-bower-files": "2.13.1",
     "prettier": "1.13.5",
     "require-dir": "1.0.0",