fix linting error: missing space on line 81

Author: amarantha-k

src/js/05-tabset.js

@@ -78,7 +78,7 @@ function activateTab (e) {
   e.preventDefault()
   var tab = this.tab
   var pane = this.pane
-  var tabMenu= document.querySelector('.tabs ul')
+  var tabMenu = document.querySelector('.tabs ul')
   var nodeTab = document.querySelector('.tabs > ul')
   var nodeDropdownTabNode = document.querySelector('.other-tablist')
   if (tab.parentNode.classList[0] === 'other-tablist') {