Delete market.js

-const fetch = require('node-fetch');
-const fs = require('fs');
-const url = 'https://api.upbit.com/v1/market/all?isDetails=false';
-const options = {method: 'GET', headers: {Accept: 'application/json'}};
-
-fetch(url, options)
-  .then(res => res.json())
-  .then(json => {
-      var coinName = [];
-      var j = 0;
-      var file = 'coin_name.txt';
-      fs.open(file,'w',function(err,fd){
-          if(err) throw err;
-      });
-      for (i=0;i<json.length;i++) {
-        if (json[i].market.indexOf("KRW")>-1){
-            console.log(json[i].market);
-            coinName[j] = json[i].market;
-            j=j+1;
-        }
-      }
-      console.log(coinName);
-      fs.writeFile(file,coinName,'utf8',function(error){
-        console.log('write end')
-      });
-    })
-  .catch(err => console.error('error:' + err));
\ No newline at end of file