Update grunt-shell-spawn to the latest version 🚀

[greenkeeper]

The devDependency grunt-shell-spawn was updated from 0.3.12 to 0.4.0.

This version is not covered by your current version range.

If you don’t accept this pull request, your project will work just like it did before. However, you might be missing out on a bunch of new features, fixes and/or performance improvements from the dependency update.

---

Release Notes for Update dependencies; require node.js >= 4.x; added CI

Update package to 0.4.0, raised min dep of node.js to 4 due to
dependencies (proven through CI: cannot support 0.12.0 due to
the dependency chain), and add AppVeyor and Travis CI builds.
Updated the readme with build badges.

Commits

The new version differs by 3 commits.

• 1b8e5ff fix appveyor build badge in readme [ci skip]
• b35bee9 Update package to 0.4.0, raised min dep of node.js to 4 due to
• 173a7ed Update readme [ci skip]

See the full diff

FAQ and help

There is a collection of frequently asked questions. If those don’t help, you can always ask the humans behind Greenkeeper.

---

Your Greenkeeper bot 🌴