Update version info

services/network_service.go

@@ -87,8 +87,9 @@ func (s *NetworkAPIService) NetworkOptions(
 ) (*types.NetworkOptionsResponse, *types.Error) {
 	return &types.NetworkOptionsResponse{
 		Version: &types.Version{
-			RosettaVersion: "1.4.2",
+			RosettaVersion:    RosettaVersion,
-			NodeVersion:    "0.0.1",
+			NodeVersion:       NodeVersion,
+			MiddlewareVersion: &MiddlewareVersion,
 		},
 		Allow: &types.Allow{
 			OperationStatuses: bitcoin.OperationStatuses,

services/network_service_test.go

@@ -27,10 +27,12 @@ import (
 )
 
 var (
+	middlewareVersion     = "0.0.2"
 	defaultNetworkOptions = &types.NetworkOptionsResponse{
 		Version: &types.Version{
-			RosettaVersion: "1.4.2",
+			RosettaVersion:    "1.4.4",
-			NodeVersion:    "0.0.1",
+			NodeVersion:       "0.20.1",
+			MiddlewareVersion: &middlewareVersion,
 		},
 		Allow: &types.Allow{
 			OperationStatuses: bitcoin.OperationStatuses,

services/types.go

@@ -22,6 +22,25 @@ import (
 	"github.com/coinbase/rosetta-sdk-go/types"
 )
 
+const (
+	// RosettaVersion is the version of the
+	// Rosetta Specification we are using.
+	RosettaVersion = "1.4.4"
+
+	// NodeVersion is the version of
+	// bitcoin core we are using.
+	NodeVersion = "0.20.1"
+)
+
+var (
+	// MiddlewareVersion is the version
+	// of rosetta-bitcoin. We set this as a
+	// variable instead of a constant because
+	// we typically need the pointer of this
+	// value.
+	MiddlewareVersion = "0.0.2"
+)
+
 // Client is used by the servicers to get Peer information
 // and to submit transactions.
 type Client interface {