Update dependencies (#723)

* go get -u github.com/Azure/azure-sdk-for-go

* github.com/aws/aws-sdk-go upgrade => v1.30.11

* github.com/digitalocean/godo upgrade => v1.35.1

* go get -u github.com/golang/protobuf

vendor/google.golang.org/protobuf/proto/extension.go

@@ -0,0 +1,36 @@
+// Copyright 2019 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package proto
+
+import (
+	"google.golang.org/protobuf/reflect/protoreflect"
+)
+
+// HasExtension reports whether an extension field is populated.
+// It panics if ext does not extend m.
+func HasExtension(m Message, ext protoreflect.ExtensionType) bool {
+	return m.ProtoReflect().Has(ext.TypeDescriptor())
+}
+
+// ClearExtension clears an extension field such that subsequent
+// HasExtension calls return false.
+// It panics if ext does not extend m.
+func ClearExtension(m Message, ext protoreflect.ExtensionType) {
+	m.ProtoReflect().Clear(ext.TypeDescriptor())
+}
+
+// GetExtension retrieves the value for an extension field.
+// If the field is unpopulated, it returns the default value for
+// scalars and an immutable, empty value for lists, maps, or messages.
+// It panics if ext does not extend m.
+func GetExtension(m Message, ext protoreflect.ExtensionType) interface{} {
+	return ext.InterfaceOf(m.ProtoReflect().Get(ext.TypeDescriptor()))
+}
+
+// SetExtension stores the value of an extension field.
+// It panics if ext does not extend m or if value type is invalid for the field.
+func SetExtension(m Message, ext protoreflect.ExtensionType, value interface{}) {
+	m.ProtoReflect().Set(ext.TypeDescriptor(), ext.ValueOf(value))
+}