add beta version on 3box plugin

src/remixAppManager.js

@@ -162,6 +162,7 @@ export class RemixAppManager extends PluginEngine {
       displayName: '3Box Spaces Plugin',
       methods: ['isEnabled', 'openSpace', 'getValue', 'setValue'],
       events: [],
+      version: '0.1.0-beta',
       url: 'http://remix-3box.surge.sh',
       icon: 'https://raw.githubusercontent.com/3box/3box-dapp/master/public/3Box3.png',
       location: 'sidePanel'