application: Emit event when updating changes

core/application.mjs

@@ -119,11 +119,15 @@ export default class Application extends EventEmitter {
     }
 
     if (this.updating) return null
+    
     this.updating = true
+    this.emit('updating', this.updating)
 
     return this._update()
       .then((result) => {
         this.updating = false
+        this.emit('updating', this.updating)
+        
         return this.ctx.db.write()
           .then(function() { return result })
       })

package.json

@@ -1,6 +1,6 @@
 {
   "name": "service-core",
-  "version": "3.0.0-beta.12",
+  "version": "3.0.0-beta.13",
   "description": "Core boiler plate code to install node server as windows service",
   "main": "index.mjs",
   "scripts": {