Added predata step. Using RedGifs temporary API key.

src/logger.js

@@ -1,11 +1,16 @@
 'use strict';
 
 const winston = require('winston');
+require('winston-daily-rotate-file');
 
-const args = require('./cli.js')();
+const args = require('./cli')();
 
 const logger = winston.createLogger({
     level: args.logLevel,
+    format: winston.format.combine(
+        winston.format.timestamp(),
+        winston.format.json(),
+    ),
     transports: [
         new winston.transports.Console({
             level: args.logLevel,
@@ -16,6 +21,15 @@ const logger = winston.createLogger({
             ),
             timestamp: true,
         }),
+        new winston.transports.DailyRotateFile({
+            datePattern: 'YYYY-MM-DD',
+            filename: 'logs/%DATE%.log',
+        }),
+        new winston.transports.DailyRotateFile({
+            datePattern: 'YYYY-MM-DD',
+            filename: 'logs/error_%DATE%.log',
+            level: 'error',
+        }),
     ],
 });