v2.20.0
* Update URLs in CONTRIBUTING.md (#198) (Ryan Graham) * travis: drop io.js, add Node v4 and v6 (Miroslav Bajtoš) * Stop caching config files (Miroslav Bajtoš)
* Update URLs in CONTRIBUTING.md (#198) (Ryan Graham) * travis: drop io.js, add Node v4 and v6 (Miroslav Bajtoš) * Stop caching config files (Miroslav Bajtoš)