Update dependencies to enable Greenkeeper 🌴 (#172)

* chore(package): update dependencies

* docs(readme): add Greenkeeper badge

README.md

@@ -5,7 +5,7 @@
 [![Build Status](https://travis-ci.org/hoodiehq/hoodie-account-client.svg?branch=master)](https://travis-ci.org/hoodiehq/hoodie-account-client)
 [![Coverage Status](https://coveralls.io/repos/hoodiehq/hoodie-account-client/badge.svg?branch=master)](https://coveralls.io/github/hoodiehq/hoodie-account-client?branch=master)
 [![Dependency Status](https://david-dm.org/hoodiehq/hoodie-account-client.svg)](https://david-dm.org/hoodiehq/hoodie-account-client)
-[![devDependency Status](https://david-dm.org/hoodiehq/hoodie-account-client/dev-status.svg)](https://david-dm.org/hoodiehq/hoodie-account-client#info=devDependencies)
+[![devDependency Status](https://david-dm.org/hoodiehq/hoodie-account-client/dev-status.svg)](https://david-dm.org/hoodiehq/hoodie-account-client#info=devDependencies) [![Greenkeeper badge](https://badges.greenkeeper.io/hoodiehq/hoodie-account-client.svg)](https://greenkeeper.io/)
 
 `hoodie-account-client` is a JavaScript client for the [Account JSON API](http://docs.accountjsonapi.apiary.io).
 It persists session information in localStorage (or your own store API) and

package.json

@@ -50,7 +50,7 @@
     "nock": "^9.0.0",
     "npm-run-all": "^4.0.0",
     "rimraf": "^2.4.3",
-    "semantic-release": "^12.2.2",
+    "semantic-release": "^15.5.0",
     "simple-mock": "^0.8.0",
     "standard": "^11.0.0",
     "tap-min": "^1.0.0",