fix: cjs export

Author: estrattonbailey

package.json

@@ -3,8 +3,8 @@
   "version": "1.2.0",
   "description": "Making fetch happen in Typescript.",
   "source": "index.ts",
-  "main": "dist/gretchen.cjs.js",
-  "modern": "dist/gretchen.esm.js",
+  "main": "dist/gretchen.js",
+  "modern": "dist/gretchen.modern.js",
   "module": "dist/gretchen.esm.js",
   "unpkg": "dist/gretchen.iife.js",
   "types": "dist/index.d.ts",