message: Readme: use logo as title.
diff: -# Drake [![Build Status](https://travis-ci.org/mefyl/drake.svg?branch=master)](https://travis-ci.org/mefyl/drake)
  +# <img src="docs/static_files/drake_logotype@2x.png" alt="Logo - Drake" title="Drake logotype" width="300" style="max-width:300px;">
  The well-formed build system.
  -<img src="docs/static_files/drake_logotype@2x.png" alt="Logo - Drake" title="Drake logotype" width="300" style="max-width:300px;">
  +[![Build Status](https://travis-ci.org/mefyl/drake.svg?branch=master)](https://travis-ci.org/mefyl/drake)
  ## About
  