Update package.json

Co-authored-by: Ben McCann <322311+benmccann@users.noreply.github.com>

Author: yanick

package.json

@@ -2,7 +2,7 @@
   "name": "@testing-library/svelte",
   "version": "0.0.0-semantically-released",
   "description": "Simple and complete Svelte testing utilities that encourage good testing practices.",
-  "main": "src/index.js",
+  "exports": "src/index.js",
   "type": "module",
   "types": "types/index.d.ts",
   "license": "MIT",