chore(package): add exports to package.json (#3)

Author: ryoppippi

package.json

@@ -6,6 +6,13 @@
   "author": "Eric Liu (https://github.com/metonym)",
   "main": "./dist/index.js",
   "types": "./dist/index.d.ts",
+  "exports": {
+    ".": {
+      "import": "./dist/index.js",
+      "require": "./dist/index.js",
+      "types": "./dist/index.d.ts"
+    }
+  },
   "scripts": {
     "test": "bun test",
     "build": "bun --bun tsc"