fix: typescript import error

If `resolvePackageJsonExports` is `true`, an error will occur when importing: `TS7016: Could not find a declaration file for module rcedit`.

Author: Hill-98

package.json

@@ -3,7 +3,7 @@
   "version": "0.0.0-development",
   "description": "Node module to edit resources of exe",
   "type": "module",
-  "exports": "./lib/rcedit.js",
+  "main": "lib/rcedit.js",
   "types": "lib/index.d.ts",
   "files": [
     "bin",