chore: update readme

Author: posva

README.md

@@ -1,4 +1,10 @@
-# Vuefire / Vuexfire [![Build Status](https://badgen.net/circleci/github/vuejs/vuefire)](https://circleci.com/gh/vuejs/vuefire) [![coverage](https://badgen.net/codecov/c/github/vuejs/vuefire)](https://codecov.io/github/vuejs/vuefire)
+<p align="center"><a href="https://vuefire.vuejs.org" target="_blank" rel="noopener noreferrer"><img width="100" src="https://vuefire.vuejs.org/firebase-logo.svg" alt="Vue logo"></a></p>
+
+<h1 align="center">Vuefire & Vuexfire</h1>
+<p align="center">
+  <a href="https://circleci.com/gh/vuejs/vuefire"><img src="https://badgen.net/circleci/github/vuejs/vuefire" alt="Build Status"></a>
+  <a href="https://codecov.io/github/vuejs/vuefire"><img src="https://badgen.net/codecov/c/github/vuejs/vuefire" alt="Build Status"></a>
+</p>
 
 > Synchronize your data and Firebase Cloud Store database in real-time