🐛 Fix filename

Author: apertureless

README.md

@@ -1,5 +1,5 @@
 <div align="center">
-  <img width="256" heigth="256" src="/assets/icon-square-big.svg" alt="vue-chartjs logo">
+  <img width="256" heigth="256" src="/assets/vue-chartjs.svg" alt="vue-chartjs logo">
 </div>
 
 [![npm version](https://badge.fury.io/js/vue-chartjs.svg)](https://badge.fury.io/js/vue-chartjs)