import instead of require

Author: aminya

lib/main.js

@@ -4,7 +4,7 @@ import path from 'path'
 let subs = null
 let toolbar = null
 let juliaClient = null
-let HTMLPreviewView = require('./html-preview.js')
+import HTMLPreviewView from './html-preview.js'
 
 export function activate () {
     subs = new CompositeDisposable()