Update dev-dependencies

Author: wooorm

package.json

@@ -19,13 +19,13 @@
     "nlcst-to-string": "^2.0.0"
   },
   "devDependencies": {
-    "browserify": "^14.0.0",
+    "browserify": "^16.0.0",
     "esmangle": "^1.0.0",
     "nyc": "^11.0.0",
-    "remark-cli": "^4.0.0",
-    "remark-preset-wooorm": "^3.0.0",
+    "remark-cli": "^5.0.0",
+    "remark-preset-wooorm": "^4.0.0",
     "tape": "^4.0.0",
-    "xo": "^0.18.2"
+    "xo": "^0.20.0"
   },
   "scripts": {
     "build-md": "remark . --quiet --frail --output",
@@ -46,6 +46,11 @@
   "xo": {
     "space": true,
     "esnext": false,
+    "rules": {
+      "guard-for-in": "off",
+      "no-var": "off",
+      "prefer-arrow-callback": "off"
+    },
     "ignore": [
       "nlcst-normalize.js"
     ]

test.js

@@ -1,7 +1,7 @@
 'use strict';
 
 var test = require('tape');
-var normalize = require('./');
+var normalize = require('.');
 
 test('Basic', function (t) {
   t.throws(
@@ -24,8 +24,7 @@ test('Case', function (t) {
   t.equal(
     normalize({
       type: 'WordNode',
-      children: [{type: 'TextNode', value: 'Dont'}
-      ]
+      children: [{type: 'TextNode', value: 'Dont'}]
     }),
     'dont',
     'should normalize case (node)'
@@ -260,9 +259,9 @@ test('Apostrophes', function (t) {
 
 test('Dashes', function (t) {
   t.equal(
-      normalize('Don\'t Block-Level'),
-      'dont blocklevel',
-      'should normalize dashes (string)'
+    normalize('Don\'t Block-Level'),
+    'dont blocklevel',
+    'should normalize dashes (string)'
   );
 
   t.equal(