* github.com/miekg/dns
* Greatly simplify the logic for handling serial numbers. Related code was all over the place. Now it is abstracted into one testable method makeSoa. This simplifies code in many other places.
* Update docs/_providers/bind.md: Edit old text. Add SOA description.
* SOA records are now treated like any other record internally. You still can't specify them in dnsconfig.js, but that's by design.
* The URL for issue 491 was wrong in many places
* BIND: Clarify GENERATE_ZONEFILE message
* 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
