Update expected node 0.12 V8 version

[email protected] has been updated to V8 2.28, so it is expected for
[email protected] to be released with this version.

public/es6.html

@@ -38,7 +38,7 @@ <h1>ES6 on io.js</h1>
 
       <h2 class="faq-title">No more --harmony flag</h2>
       <div class="faq-body">
-        <p>On joyent/[email protected] (V8 3.26), the <code>--harmony</code> runtime flag enabled all <strong>completed</strong>, <strong>staged</strong> and <strong>in progress</strong> ES6 features together, in bulk (with the exception of nonstandard/non-harmonious semantics for <code>typeof</code> which were hidden under <code>--harmony-typeof</code>).  This meant that some really buggy or even broken features like <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Proxy">proxies</a> were just as readily available for developers as <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/function*">generators</a>, which had very little or even no known-issues. As such, it was best practice to either enable only certain features by using specific runtime harmony feature flags (e.g. <code>--harmony-generators</code>), or simply enable all of them and then use a restricted subset.</p>
+        <p>On joyent/[email protected] (V8 3.28), the <code>--harmony</code> runtime flag enabled all <strong>completed</strong>, <strong>staged</strong> and <strong>in progress</strong> ES6 features together, in bulk (with the exception of nonstandard/non-harmonious semantics for <code>typeof</code> which were hidden under <code>--harmony-typeof</code>).  This meant that some really buggy or even broken features like <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Proxy">proxies</a> were just as readily available for developers as <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/function*">generators</a>, which had very little or even no known-issues. As such, it was best practice to either enable only certain features by using specific runtime harmony feature flags (e.g. <code>--harmony-generators</code>), or simply enable all of them and then use a restricted subset.</p>
         <p>With [email protected] (V8 4.1+), all that complexity goes away. All harmony features are now logically split into three groups for <strong>shipping</strong>, <strong>staged</strong> and <strong>in progress</strong> features:</p>
 
         <ul class="task-list">