message: chore: tweak logo alt in README.md
diff: -<p align="center"><a href="https://vuejs.org" target="_blank"><img width="100"src="https://vuejs.org/images/logo.png"></a></p>
  +<p align="center"><a href="https://vuejs.org" target="_blank"><img width="100" src="https://vuejs.org/images/logo.png" alt="Vue logo"></a></p>
  <p align="center">
  <a href="https://circleci.com/gh/vuejs/vue/tree/dev"><img src="https://img.shields.io/circleci/project/vuejs/vue/dev.svg" alt="Build Status"></a>
  