get the exchange rate for the many currencies to CNY 

#Install
npm i cnyexchangerate -s
 
#Usage
1. get the USD dollar rate
    
    ```javascript
    const cnyex=require('cnyexchangerate');
    (async ()=>{
    let res=await cnyex.getRate("USD")
    
    
    })();
    ```

2.you can use JPY,EUR etc.