Changelog
c9a9e2a Added Vultr provider
a249484 Add Ovh DNS provider
2777fcd Introduce the HTTP01 challenge (#39)
e1cf7dc Add Gandi DNS provider (#36)
b4044cc Switch to vendor folder / Update third-party libraries
c3e45eb Renew certificate 20 days before expiry date
987123d Switch to Rancher v2 API
