Update many modules (#620)

* 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

vendor/github.com/aws/aws-sdk-go/internal/strings/strings.go

@@ -0,0 +1,11 @@
+package strings
+
+import (
+	"strings"
+)
+
+// HasPrefixFold tests whether the string s begins with prefix, interpreted as UTF-8 strings,
+// under Unicode case-folding.
+func HasPrefixFold(s, prefix string) bool {
+	return len(s) >= len(prefix) && strings.EqualFold(s[0:len(prefix)], prefix)
+}