chore - remove standard and use individual config

Standard is not as up to date and still uses a old eslint version.
Instead, use the airbnb default with a couple of modifications.

All required changes are included.

lib/debug.js

@@ -1,16 +1,17 @@
 'use strict'
 
-var index = {
+let index = {
   debugMode: /\bredis\b/i.test(process.env.NODE_DEBUG)
 }
 // Lazy load the main file
-process.nextTick(() => (index = require('../')))
+process.nextTick(() => { index = require('../') })
 
 /**
  * @description Print a debug statement if in debug mode
  */
-function debug () {
+function debug() {
   if (index.debugMode) {
+    // eslint-disable-next-line
     console.error.apply(null, arguments)
   }
 }