Update dependencies to enable Greenkeeper 🌴 (#4)

* chore(package): update dependencies

* docs(readme): add Greenkeeper badge

Author: greenkeeper[bot]

README.md

@@ -1,5 +1,7 @@
 # create-node
 
+[![Greenkeeper badge](https://badges.greenkeeper.io/lukechilds/create-node.svg)](https://greenkeeper.io/)
+
 Converts an HTML string to a DOM node.
 
 [![Build Status](https://travis-ci.org/lukechilds/create-node.svg?branch=master)](https://travis-ci.org/lukechilds/create-node)

package.json

@@ -44,15 +44,15 @@
   },
   "homepage": "https://github.com/lukechilds/create-node#readme",
   "devDependencies": {
-    "ava": "^0.15.2",
+    "ava": "^0.19.1",
     "babel-cli": "^6.9.0",
     "babel-plugin-add-module-exports": "^0.2.1",
     "babel-preset-es2015": "^6.9.0",
     "coveralls": "^2.11.9",
     "eslint-config-xo-lukechilds": "^1.0.0",
-    "jsdom": "^9.1.0",
-    "nyc": "^7.1.0",
+    "jsdom": "^11.0.0",
+    "nyc": "^11.0.2",
     "window": "^3.1.2",
-    "xo": "^0.17.1"
+    "xo": "^0.18.2"
   }
 }