fix: incorrect main field (#58)

Author: socar-dosii

package.json

@@ -1,11 +1,11 @@
 {
   "name": "@r2don/react-naver-map",
-  "version": "0.0.16",
+  "version": "0.0.17",
   "author": {
     "name": "r2don",
     "email": "leejj2002@naver.com"
   },
-  "main": "dist/index.umd.js",
+  "main": "dist/index.cjs.js",
   "types": "types/index.d.ts",
   "module": "dist/index.es.js",
   "repository": {