raspbian wifi support, updated docs

docs/v4/gettingstarted.html

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-  <link rel="stylesheet" href="styles.css?9823642">
-  <script src="main.js?81239823"></script>
+  <link rel="stylesheet" href="styles.css">
+  <script src="main.js"></script>
 
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               <h3>Attention:</h3>
               <p>This library is supposed to be used as a <a href="https://nodejs.org/en/" rel="nofollow">node.js</a> backend/server-side library and will definilely not work within a browser.</p>
 
-              <h2>Installation</h2>
-              <pre>$ npm install systeminformation --save</pre>
+              <h2>Installation (old version 4)</h2>
+              <pre>$ npm install systeminformation@4 —save</pre>
               <h2>Usage</h2>
               <p>All functions (except <span class="code">version</span> and <span class="code">time</span>) are implemented as asynchronous functions. Here a small example how to use them:</p>
               <pre><code class="js">const si = require('systeminformation');