[Doppins] Upgrade dependencies

[doppins-bot]

Hi, and thank you for trying out Doppins.

This initial pull request upgrades all your dependency ranges to the latest available version. From now on any new dependency releases will result in a pull request to your repository, submitted in real-time.

Make sure that it doesn't break anything, and happy merging! :shipit:

The upgraded dependencies are:

---

• lodash from 3.10.1 to 4.5.1
• strip-json-comments from 2.0.0 to 2.0.1
• irc from 0.4.0 to 0.4.1
• slack-client from 1.5.0 to 2.0.2
• chai from 3.4.1 to 3.5.0
• eslint from ^1.10.2 to ^2.2.0
• sinon from 1.17.2 to 1.17.3
• mocha from 2.3.4 to 2.4.5
• eslint-config-airbnb from ^3.1.0 to ^6.0.2

[ekmartin]

Closed in favor of #82