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/unifyOptions.js

@@ -5,9 +5,9 @@ const URL = require('url')
 
 // TODO: Improve the unify performance by checking for the arguments length
 // before trying to access that argument.
-function unifyOptions (portArg, hostArg, options) {
+function unifyOptions(portArg, hostArg, options) {
   if (typeof portArg === 'number' || (typeof portArg === 'string' && /^\d+$/.test(portArg))) {
-    var host
+    let host
     if (typeof hostArg === 'string') {
       host = hostArg
     } else {
@@ -24,6 +24,7 @@ function unifyOptions (portArg, hostArg, options) {
 
     const parsed = URL.parse(portArg.url || portArg, true, true)
 
+    // eslint-disable-next-line
     // [redis:]//[[user][:password]@][host][:port][/db-number][?db=db-number[&password=bar[&option=value]]]
     if (parsed.slashes) { // We require slashes
       if (parsed.auth) {
@@ -42,11 +43,9 @@ function unifyOptions (portArg, hostArg, options) {
         options.port = parsed.port
       }
       if (parsed.search !== '') {
-        for (var elem in parsed.query) {
-          /* istanbul ignore if */
-          if (!Object.prototype.hasOwnProperty.call(parsed.query, elem)) {
-            continue
-          }
+        const keys = Object.keys(parsed.query)
+        for (var i = 0; i < keys.length; i++) {
+          const elem = keys[i]
           // If options are passed twice, only the parsed options will be used
           if (elem in options) {
             if (options[elem] === parsed.query[elem]) {