add "unpkg" field in package.json

Author: luizbills

package.json

@@ -1,6 +1,6 @@
 {
     "name": "litecanvas",
-    "version": "0.92.2",
+    "version": "0.92.3",
     "description": "Lightweight HTML5 canvas 2D game engine suitable for small projects and creative coding. Inspired by PICO-8 and P5/Processing.",
     "license": "MIT",
     "author": "Luiz Bills <luizbills@pm.me>",
@@ -17,6 +17,7 @@
     "main": "./src/index.js",
     "module": "./src/index.js",
     "types": "./types/index.d.ts",
+    "unpkg": "./dist/dist.dev.js",
     "keywords": [
         "game engine",
         "game development",