Update homepage with new version number and links

Author: mrmrs

index.html

@@ -30,7 +30,7 @@
     <a href="/" class="dib f5 f4-ns fw6 mt0 mb1 link black-70 dim" title="Home">
       Tachyons
       <div class="dib">
-        <small class="nowrap f6 mt2 mt3-ns pr2 black-70 fw2">v4.1.3</small>
+        <small class="nowrap f6 mt2 mt3-ns pr2 black-70 fw2">v4.2.0</small>
       </div>
     </a>
   </div>
@@ -95,7 +95,7 @@ <h1 class="f4 fw6 f1-ns lh-title measure mt0">
   </div>
   <div class="fl-l w-50-l tl tc-ns pt4 pt5-ns">
     <a class="fw6 dib ba b--black-20 bg-white-05 f5 ph4 pv3 link br2 black-70 grow" href="https://raw.githubusercontent.com/tachyons-css/tachyons/master/css/tachyons.min.css">Download
-<code class="f6 fw4 di">v4.1.3</code>
+<code class="f6 fw4 di">v4.2.0</code>
 </a>
 
 
@@ -107,9 +107,9 @@ <h1 class="mtn f4 ttu tracked">Getting Started</h1>
             <p class="f5 measure lh-copy">
               Copy the line of code below and paste it in the head of the html file(s) you want to include tachyons in.
             </p>
-<pre class="pre black-70" style="overflow: auto"><code class="code f6 dib pa2 bg-black-70 washed-green" style="font-size: 14px;">&lt;link rel="stylesheet" href="https://npmcdn.com/tachyons@4.1.3/css/tachyons.min.css"/&gt;</code></pre>
+<pre class="pre black-70" style="overflow: auto"><code class="code f6 dib pa2 bg-black-70 washed-green" style="font-size: 14px;">&lt;link rel="stylesheet" href="https://unpkg.com/tachyons@4.2.0/css/tachyons.min.css"/&gt;</code></pre>
 <p class="mt4"><b>or</b> install via npm</p>
-<pre class="pre black-70" style="overflow: auto"><code class="code f6 dib pa2 bg-black-70 washed-green" style="font-size: 14px;">npm install --save-dev tachyons@4.1.3</code></pre>
+<pre class="pre black-70" style="overflow: auto"><code class="code f6 dib pa2 bg-black-70 washed-green" style="font-size: 14px;">npm install --save-dev tachyons@4.2.0</code></pre>
 <p class="mt4"><b>or</b> grab all the source files and build+develop locally</p>
 <pre class="pre" style="overflow: auto"><code class="code f6 dib pa2 bg-black-70 washed-green" style="font-size: 14px;">git clone git@github.com:tachyons-css/tachyons.git
 cd tachyons