feat(api): add go module support (#3408)

* feat(api): experiment with go mod

* feat(api): experiment with go mod

* feat(api): experiment with go mod

* feat(api): add go module support

* refactor(api): go fmt

api/http/handler/webhooks/webhook_create.go

@@ -4,11 +4,11 @@ import (
 	"net/http"
 
 	"github.com/asaskevich/govalidator"
+	"github.com/gofrs/uuid"
 	httperror "github.com/portainer/libhttp/error"
 	"github.com/portainer/libhttp/request"
 	"github.com/portainer/libhttp/response"
 	"github.com/portainer/portainer/api"
-	"github.com/satori/go.uuid"
 )
 
 type webhookCreatePayload struct {