Update package.json

Add "type": "module" to /auth/package.json to fix #129

Author: chriscurnow

auth/package.json

@@ -4,5 +4,6 @@
   "main": "../dist/auth/index.cjs.js",
   "module": "../dist/auth/index.esm.js",
   "typings": "../dist/auth/index.d.ts",
-  "sideEffects": false
+  "sideEffects": false,
+  "type": "module"
 }