fix(type): add properties type for IClientSubscribeOptions (#1378)

Co-authored-by: YuShifan <894402575bt@gmail.com>

Author: Yoseph Maguire

types/lib/client-options.d.ts

@@ -179,7 +179,14 @@ export interface IClientSubscribeOptions {
   /*
   * Retain Handling option
   * */
-  rh?: number
+  rh?: number,
+  /*
+  *  MQTT 5.0 properies object of subscribe
+  * */
+  properties?: {
+    subscriptionIdentifier?: number,
+    userProperties?: UserProperties
+  }
 }
 export interface IClientReconnectOptions {
   /**