fix: correct module property

Author: paraillegal

package.json

@@ -11,7 +11,7 @@
     "url": "https://opencollective.com/unified"
   },
   "main": "dist/index.js",
-  "module": "dist/react-markdown.esm.js",
+  "module": "dist/react-remark.esm.js",
   "typings": "dist/index.d.ts",
   "sideEffects": false,
   "files": [