use winston instead of bunyan

lib/logger.js

@@ -1,38 +1,19 @@
-'use strict'
-
-var Bunyan = require('bunyan')
-var async = require('async')
+const winston = require('winston')
 
 var logLevel = typeof process.env.LAMASSU_ENV === 'string'
 ? process.env.LAMASSU_ENV
 : 'info'
 
-console.log('DEBUG1: %s, %s', process.env.LAMASSU_ENV, logLevel)
-var bunyan = Bunyan.createLogger({name: 'lamassu-server', level: logLevel})
+const logger = new winston.Logger({
+  level: logLevel,
+  transports: [
+    new (winston.transports.Console)({colorize: true})
+  ]
+})
 
 // log version
 var version = require('../package.json').version
-bunyan.info('Version: %s', version)
+logger.info('Version: %s', version)
 
-// log git stuff (optional)
-// `git-rev` omits `err` param in callback, without this wrapper
-// `async` interprets returned values as errors.
-function wrapper (fn, cb) {
-  fn(function (value) {
-    cb(null, value)
-  })
-}
-try {
-  var git = require('git-rev')
 
-  async.parallel([
-    async.apply(wrapper, git.branch),
-    async.apply(wrapper, git.short)
-  ],
-    function (err, values) {
-      if (err) return bunyan.error(err)
-      bunyan.info('Git: #%s @%s', values[0], values[1])
-    })
-} catch (_) {}
-
-module.exports = bunyan
+module.exports = logger