updated docs

docs/v4/index.html

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           <a href="https://lgtm.com/projects/g/sebhildebrandt/systeminformation/alerts" rel="nofollow"><img src="https://camo.githubusercontent.com/66428127fdde80fc8247a0c1df4c651f3a6b1c0a/68747470733a2f2f696d672e736869656c64732e696f2f6c67746d2f616c657274732f672f73656268696c64656272616e64742f73797374656d696e666f726d6174696f6e2e7376673f7374796c653d666c61742d737175617265" alt="Total alerts" data-canonical-src="https://img.shields.io/lgtm/alerts/g/sebhildebrandt/systeminformation.svg?style=flat-square" style="max-width:100%;"></a>
           <a href="https://github.com/sebhildebrandt/systeminformation/blob/master/LICENSE"><img src="https://camo.githubusercontent.com/4b5966a2a252ee0f241a1e03b13417178eb4964f/68747470733a2f2f696d672e736869656c64732e696f2f62616467652f6c6963656e73652d4d49542d626c75652e7376673f7374796c653d666c61742d737175617265" alt="MIT license" data-canonical-src="https://img.shields.io/badge/license-MIT-blue.svg?style=flat-square" style="max-width:100%;"></a>
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+        <div class="text"><span class="bold">Version 4 maintenance</span>: We are still maintaining version 4 and providing especially fixes to security issues and other important fixes. New functionality is only added to the new version 5, so please consider upgrading to version 5 soon. <span class="bold">Version 5 is NOT fully backward compatible to version 4!</span> Be aware, there are some breaking changes. Please refer to the <a href="../changes.html">Version 5 - Changes</a> page to see a full documentation of all changes you should have a look on.</div>
+        <div class="text larger"><span class="bold">Version 5 documentation</span> can be found <a href="../index.html">here</a>.</div>
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         <div class="title-small">Issues</div>
         <div class="text"><span class="bold">Security issues</span>: Please have a look at our <a href="security.html">security advisories</a></div>
         <div class="text">If you run into problems, please check out <a href="issues.html">known issues page</a> first. If you still have problems, please feel free to open an issue on our <a href="https://github.com/sebhildebrandt/systeminformation/issues">github page</a></div>
-        <div class="title-small">Upcoming ...</div>
-        <div class="text"><span class="bold">MacOS on ARM</span> - new hardware already arrived and we made quite a few changes to support Apple silicon M1 chips. <a href="https://github.com/sebhildebrandt/systeminformation/issues/453">Current status is documented here.</a><br /></div>
-        <div class="text"><span class="bold">Verion 5:</span> We are planning a new major version with some minor breaking changes and some additional features. We will try to make this available Q1 of 2021.<br /><br /></div>
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