Add type module after reading webpack docs

Author: pksjce

package.json

@@ -4,6 +4,7 @@
   "description": "An implementation of GitHub's Primer Design System using React",
   "main": "lib/index.js",
   "module": "lib-esm/index.js",
+  "type":"module",
   "exports":{
     ".": "./lib-esm/index.js",
     "./drafts": "./lib-esm/drafts.js",