Update checker

server/types.go

@@ -317,6 +317,11 @@ type apiHealthResponse struct {
 	Healthy bool `json:"healthy"`
 }
 
+type apiVersionResponse struct {
+	Version    string `json:"version"`
+	ConfigHash string `json:"config_hash"`
+}
+
 type apiStatsResponse struct {
 	Messages     int64   `json:"messages"`
 	MessagesRate float64 `json:"messages_rate"` // Average number of messages per second
@@ -482,6 +487,7 @@ type apiConfigResponse struct {
 	BillingContact     string   `json:"billing_contact"`
 	WebPushPublicKey   string   `json:"web_push_public_key"`
 	DisallowedTopics   []string `json:"disallowed_topics"`
+	ConfigHash         string   `json:"config_hash"`
 }
 
 type apiAccountBillingPrices struct {