Adjustments for Pixi.JS 5.0.

package.json

@@ -21,7 +21,7 @@
     "license": "LGPL-3.0-or-later",
     "devDependencies": {
         "@pixi/jsdoc-template": "^2.4.2",
-        "gulp": "^4.0.0",
+        "gulp": "^4.0.1",
         "gulp-concat": "^2.6.1",
         "gulp-rename": "^1.4.0",
         "gulp-replace": "^1.0.0",
@@ -37,7 +37,7 @@
         "pixi-filters": "^2.7.1",
         "pixi-particles": "^4.1.0",
         "pixi-projection": "^0.2.7",
-        "pixi.js": "^4.8.7",
+        "pixi.js": "^5.0.0",
         "propagating-hammerjs": "^1.4.6"
     }
 }