inetChecksite() possible security issue fix

docs/v4/gettingstarted.html

@@ -67,7 +67,7 @@
               <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 (old version 4)</h2>
-              <pre>$ npm install systeminformation@4 —save</pre>
+              <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');