fixed composer.json

Aloha! 
Google says "dist" and type=git are incompatible, 
I guess you should use zip, or kick the while dist-section (doesnt make so much sense as you want to ship it as php-sources)

require your package results in 
<pre><code>"Downloader "Composer\Downloader\GitDownloader" is a source type downloader and can not be used to download dist"</code></pre>
Merge pull request #1 from leberknecht/patch-1

fixed composer.json