docs(readme): make sure all badges are linked

README.md

@@ -1,4 +1,4 @@
-# Wilderness core · ![gzip size](http://img.badgesize.io/https://unpkg.com/wilderness-core/dist/wilderness-core.production.js?compression=gzip&label=gzip%20size&style=flat) [![test coverage](https://img.shields.io/coveralls/colinmeinke/wilderness-core/master.svg?style=flat)](https://coveralls.io/github/colinmeinke/wilderness-core) [![travisci](https://img.shields.io/travis/colinmeinke/wilderness-core.svg?style=flat)]() ![npm version](https://img.shields.io/npm/v/wilderness-core.svg?style=flat)
+# Wilderness core · [![gzip size](http://img.badgesize.io/https://unpkg.com/wilderness-core/dist/wilderness-core.production.js?compression=gzip&label=gzip%20size&style=flat)](https://unpkg.com/wilderness-core/dist/wilderness-core.production.js) [![test coverage](https://img.shields.io/coveralls/colinmeinke/wilderness-core/master.svg?style=flat)](https://coveralls.io/github/colinmeinke/wilderness-core) [![travisci](https://img.shields.io/travis/colinmeinke/wilderness-core.svg?style=flat)](https://travis-ci.org/colinmeinke/wilderness-core) [![npm version](https://img.shields.io/npm/v/wilderness-core.svg?style=flat)](https://www.npmjs.com/package/wilderness-core)
 
 The SVG animation engine behind
 [Wilderness](https://github.com/colinmeinke/wilderness).