cover-phone-num v1.0.1

Usage: 1. yarn add cover-phone-num

2. const coverPhone = require("cover-phone-num");

3. coverPhone("151xxxxxxxx", [start], [length], [symbol], [rule])

4. Default values:
    start: 3
    length: 4
    symbol: *
    rule: /^1([38][0-9]|4[579]|5[0-3,5-9]|6[6]|7[0135678]|9[89])\d{8}$/
    
5. 除了第一个参数，后面的参数都是可选