Removed HHVM status from readme since service providing it seems to b…

…e down for a while [skip ci]

README.md

@@ -14,7 +14,6 @@ The framework is easy to adjust to meet your needs, because Yii has been designe
 [![Reference Status](https://www.versioneye.com/php/yiisoft:yii2/reference_badge.svg)](https://www.versioneye.com/php/yiisoft:yii2/references)
 [![Build Status](https://img.shields.io/travis/yiisoft/yii2.svg)](http://travis-ci.org/yiisoft/yii2)
 [![Dependency Status](https://www.versioneye.com/php/yiisoft:yii2/dev-master/badge.png)](https://www.versioneye.com/php/yiisoft:yii2/dev-master)
-[![HHVM Status](https://img.shields.io/hhvm/yiisoft/yii2-dev.svg)](http://hhvm.h4cc.de/package/yiisoft/yii2-dev)
 [![Code Coverage](https://scrutinizer-ci.com/g/yiisoft/yii2/badges/coverage.png?s=31d80f1036099e9d6a3e4d7738f6b000b3c3d10e)](https://scrutinizer-ci.com/g/yiisoft/yii2/)
 [![Scrutinizer Quality Score](https://scrutinizer-ci.com/g/yiisoft/yii2/badges/quality-score.png?s=b1074a1ff6d0b214d54fa5ab7abbb90fc092471d)](https://scrutinizer-ci.com/g/yiisoft/yii2/)
 [![Code Climate](https://img.shields.io/codeclimate/github/yiisoft/yii2.svg)](https://codeclimate.com/github/yiisoft/yii2)