fix cjs tyo

Author: torinmb

package.json

@@ -3,7 +3,7 @@
   "version": "0.2.6",
   "description": "core glsl and js framework for shader-park",
   "main": "dist/shader-park-core.esm.js",
-  "csj": "dist/shader-park-core.cjs.js",
+  "cjs": "dist/shader-park-core.cjs.js",
   "module": "dist/shader-park-core.esm.js",
   "browser": "dist/shader-park-core.umd.js",
   "p5": "dist/shader-park-p5.js",