Merge branch 'fix-logger-type' into 'master'

Fix typo

See merge request !15

logger.js

 const {​​​​​ createLogger, transports, format }​​​​​ = require('winston')
 
-constlogger = createLogger({​​​​​
+const logger = createLogger({​​​​​
   transports: [
     newtransports.File({​​​​​
       filename:'error.log',