communicate error

src/index.ts

@@ -282,7 +282,9 @@ export default class Updater {
                                                 progressCallback(`Error on remote`);
                                                 reject("Error: command does not exist");
                                         }
-                                }, () => { reject("Error: Failed to start notify"); });                        
+                                }, (error) => { reject("Error: Failed to start notify");
+                                        console.error(error);
+                                 });                        
                 });
         }
 }