🔥 Remove lib version from vue-chartjs object

The lib version is also defined in the webpack banner plugin, so actually there is no need to include it into the lib object.
Closes issue #310

Author: apertureless

src/index.js

@@ -13,7 +13,6 @@ import {
 } from './BaseCharts'
 
 const VueCharts = {
-  version: LIB_VERSION,
   Bar,
   HorizontalBar,
   Doughnut,