support class binding object syntax

Author: forsartis

purgecss/index.js

@@ -2,7 +2,8 @@ const postcss = require('postcss');
 
 let config = {
   content: ['./public/**/*.html', './src/**/*.vue'],
-  defaultExtractor: content => content.match(/[A-z0-9-_:/]+/g) || [],
+  defaultExtractor: content =>
+    content.match(/[A-Za-z0-9-_/:]*[A-Za-z0-9-_/]+/g) || [],
 };
 
 module.exports = postcss.plugin('tailwind-purgecss', function(opts) {