Bump cross-spawn from 4.0.0 to 6.0.6

Bumps [cross-spawn](https://github.com/moxystudio/node-cross-spawn) from 4.0.0 to 6.0.6.
- [Changelog](https://github.com/moxystudio/node-cross-spawn/blob/v6.0.6/CHANGELOG.md)
- [Commits](moxystudio/node-cross-spawn@4.0.0...v6.0.6)

---
updated-dependencies:
- dependency-name: cross-spawn
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

package.json

@@ -36,7 +36,7 @@
     "babel-preset-es2016": "6.11.3",
     "babel-preset-react": "6.11.1",
     "chalk": "1.1.3",
-    "cross-spawn": "4.0.0",
+    "cross-spawn": "6.0.6",
     "css-loader": "0.23.1",
     "eslint": "3.1.1",
     "eslint-loader": "1.4.1",