feature/cache: Expose correct index file

Author: Intellicode

package.json

@@ -2,7 +2,7 @@
   "name": "graphql-resolver-cache",
   "version": "1.0.0",
   "description": "Caching for Graphql resolvers",
-  "main": "index.js",
+  "main": "src/index.js",
   "scripts": {
     "format": "prettier  --trailing-comma es5 --single-quote --write src/**/*.js",
     "lint": "eslint src",