Update dev-dependencies

Author: wooorm

package.json

@@ -24,13 +24,13 @@
     "hast-util-is-element": "^1.0.0"
   },
   "devDependencies": {
-    "browserify": "^13.0.0",
+    "browserify": "^14.0.0",
     "esmangle": "^1.0.1",
     "nyc": "^10.0.0",
     "remark-cli": "^3.0.0",
     "remark-preset-wooorm": "^2.0.0",
     "tape": "^4.4.0",
-    "xo": "^0.17.0"
+    "xo": "^0.18.0"
   },
   "scripts": {
     "build-md": "remark . --quiet --frail --output",
@@ -44,6 +44,7 @@
   },
   "xo": {
     "space": true,
+    "esnext": false,
     "ignores": [
       "hast-util-transparent.js"
     ]