Fix invalid version number format and add @pixi/extensions since it's a missing dependency.

Author: colossatr0n

.gitignore

@@ -6,3 +6,4 @@ coverage/
 package-lock.json
 jsconfig.json
 src/content_scripts/safari.js
+*~

package.json

@@ -1,6 +1,6 @@
 {
   "name": "Surfingkeys",
-  "version": "1.12",
+  "version": "1.12.0",
   "description": "Map your keys for web surfing, expand your browser with javascript and keyboard.",
   "main": "background.js",
   "directories": {
@@ -68,6 +68,7 @@
     "@pixi/ticker": "^6.2.1",
     "@pixi/unsafe-eval": "^6.2.1",
     "@pixi/utils": "^6.2.1",
+    "@pixi/extensions": "^6.2.1",
     "ace-builds": "^1.4.12",
     "dompurify": "^2.3.1",
     "js-base64": "^3.7.2",