* Update many modules.
go get -u golang.org/x/net
go get -u github.com/aws/aws-sdk-go
go get -u golang.org/x/oauth2
go get -u google.golang.org/api
go get -u gopkg.in/yaml.v2
go mod tidy
* Update modules
go get -u github.com/tiramiseb/go-gandi
go get -u github.com/miekg/dns
go mod tidy
* new abstraction around storage
* re-work completely to fit new acme package pre-solving paradigm
* vault storage plugin
* add some vendor
* delete old vendor pinning mechanism
