Fix CHANGELOG.md markup

**Before**:
![2014-10-30 0 47 31](https://cloud.githubusercontent.com/assets/290782/4828858/17f2249a-5f83-11e4-85d8-031458568a43.png)

**After**:
![2014-10-30 0 47 45](https://cloud.githubusercontent.com/assets/290782/4828857/17ef1f2a-5f83-11e4-814d-a6a5e8ab3be2.png)