doc: Update README.md #57

Author: jaywcjlove

packages/core/README.md

@@ -44,7 +44,7 @@ npm install province-city-china --save-dev
 | [@province-city-china/city](https://github.com/uiwjs/province-city-china/tree/master/packages/city) | 地级(城市) | [![npm package](https://img.shields.io/npm/v/@province-city-china/city.svg)](https://www.npmjs.com/package/@province-city-china/city) | ![](https://img.shields.io/bundlephobia/min/@province-city-china/city) |
 | [@province-city-china/area](https://github.com/uiwjs/province-city-china/tree/master/packages/area) | 县级(区县) | [![npm package](https://img.shields.io/npm/v/@province-city-china/area.svg)](https://www.npmjs.com/package/@province-city-china/area) | ![](https://img.shields.io/bundlephobia/min/@province-city-china/area) |
 | [@province-city-china/town](https://github.com/uiwjs/province-city-china/tree/master/packages/town) | 乡级(乡镇/街) | [![npm package](https://img.shields.io/npm/v/@province-city-china/town.svg)](https://www.npmjs.com/package/@province-city-china/town) | ![](https://img.shields.io/bundlephobia/min/@province-city-china/town) |
-| [@province-city-china/level](https://github.com/uiwjs/province-city-china/tree/master/packages/level) | 总数据(省/地/县/乡)层级数据 | [![npm package](https://img.shields.io/npm/v/@province-city-china/level.svg)](https://www.npmjs.com/package/@province-city-china/level) | ![](https://img.shields.io/bundlephobia/min/@province-city-china/level) |
+| [@province-city-china/level](https://github.com/uiwjs/province-city-china/tree/master/packages/level) | 总数据(省/地/县)层级数据 | [![npm package](https://img.shields.io/npm/v/@province-city-china/level.svg)](https://www.npmjs.com/package/@province-city-china/level) | ![](https://img.shields.io/bundlephobia/min/@province-city-china/level) |
 | [@province-city-china/utils](https://github.com/uiwjs/province-city-china/tree/master/packages/utils) | 提供使用数据方法 | [![npm package](https://img.shields.io/npm/v/@province-city-china/utils.svg)](https://www.npmjs.com/package/@province-city-china/utils) | ![](https://img.shields.io/bundlephobia/min/@province-city-china/utils) |
 | [@province-city-china/types](https://github.com/uiwjs/province-city-china/tree/master/packages/types) | 类型文件 | [![npm package](https://img.shields.io/npm/v/@province-city-china/types.svg)](https://www.npmjs.com/package/@province-city-china/types) | - |
 | [@province-city-china/district-code](https://github.com/uiwjs/province-city-china/tree/master/packages/district-code) | 国内长途电话区号 | [![npm package](https://img.shields.io/npm/v/@province-city-china/district-code.svg)](https://www.npmjs.com/package/@province-city-china/district-code) | - |
@@ -113,7 +113,7 @@ const city = require('province-city-china/dist/city.json');
 | ---- | ---- | ---- | ---- |  ---- |
 | 国家和地区代码列表([#13](https://github.com/uiwjs/province-city-china/issues/13)) | [country.json](https://github.com/uiwjs/province-city-china/blob/gh-pages/country.json) ([min](https://github.com/uiwjs/province-city-china/blob/gh-pages/country.min.json)) | [country.csv](https://github.com/uiwjs/province-city-china/blob/gh-pages/country.csv) | - | [csv](https://unpkg.com/province-city-china/dist/country.csv) / [json](https://unpkg.com/province-city-china/dist/country.json) |
 | 总数据(省/地/县/乡) | [data.json](https://github.com/uiwjs/province-city-china/blob/gh-pages/data.json) ([min](https://github.com/uiwjs/province-city-china/blob/gh-pages/data.min.json)) | [data.csv](https://github.com/uiwjs/province-city-china/blob/gh-pages/data.csv) | [data.sql](https://github.com/uiwjs/province-city-china/blob/gh-pages/data.sql) | [data.sql](https://unpkg.com/province-city-china/dist/data.sql) / [csv](https://unpkg.com/province-city-china/dist/data.csv) / [json](https://unpkg.com/province-city-china/dist/data.json) |
-| 总数据(省/地/县/乡)层级数据 | [level.json](https://github.com/uiwjs/province-city-china/blob/gh-pages/level.json) ([min](https://github.com/uiwjs/province-city-china/blob/gh-pages/level.min.json)) | - | - | [level.json](https://unpkg.com/province-city-china/dist/level.json) |
+| 总数据(省/地/县)层级数据 | [level.json](https://github.com/uiwjs/province-city-china/blob/gh-pages/level.json) ([min](https://github.com/uiwjs/province-city-china/blob/gh-pages/level.min.json)) | - | - | [level.json](https://unpkg.com/province-city-china/dist/level.json) |
 | 省级(省/直辖市/特别行政区) | [province.json](https://github.com/uiwjs/province-city-china/blob/gh-pages/province.json) ([min](https://github.com/uiwjs/province-city-china/blob/gh-pages/province.min.json)) | [province.csv](https://github.com/uiwjs/province-city-china/blob/gh-pages/province.csv) | - | [province.json](https://unpkg.com/province-city-china/dist/province.json) / [csv](https://unpkg.com/province-city-china/dist/province.csv) |
 | 地级(城市) | [city.json](https://github.com/uiwjs/province-city-china/blob/gh-pages/city.json) ([min](https://github.com/uiwjs/province-city-china/blob/gh-pages/city.min.json)) | [city.csv](https://github.com/uiwjs/province-city-china/blob/gh-pages/city.csv) | - | [city.json](https://unpkg.com/province-city-china/dist/city.json) / [csv](https://unpkg.com/province-city-china/dist/city.csv) |
 | 县级(区县) | [area.json](https://github.com/uiwjs/province-city-china/blob/gh-pages/area.json) ([min](https://github.com/uiwjs/province-city-china/blob/gh-pages/area.min.json)) | [area.csv](https://github.com/uiwjs/province-city-china/blob/gh-pages/area.csv) | - | [area.json](https://unpkg.com/province-city-china/dist/area.json) / [csv](https://unpkg.com/province-city-china/dist/area.csv) |