update package to use beta version

Author: maxisam

package.json

@@ -30,7 +30,7 @@
     "rxjs": "~6.3.3",
     "tslib": "^1.9.0",
     "zone.js": "~0.8.26",
-    "ngx-progressive-image-loader": "^3.0.2",
+    "ngx-progressive-image-loader": "^4.0.0-beta.12",
     "ngx-window-token": "^2.0.1"
   },
   "devDependencies": {