Update website version number.

Author: Breakthrough

docs/index.md

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 <h4 class="wy-text-info">Intelligent scene cut detection and video splitting tool.</h4>
 
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-<h3 class="wy-text-neutral"><span class="fa fa-info-circle wy-text-info"></span>&nbsp; Latest Release: <b>v0.5</b> (August 31, 2018)</h3>
+<h3 class="wy-text-neutral"><span class="fa fa-info-circle wy-text-info"></span>&nbsp; Latest Release: <b>v0.5.1</b> (July 20, 2019)</h3>
 <a href="download/" class="btn btn-success" style="margin-bottom:8px;" role="button"><span class="fa fa-download"></span>&nbsp; <b>Download</b></a> &nbsp;&nbsp;&nbsp;&nbsp; <a href="changelog/" class="btn btn-info" style="margin-bottom:8px;" role="button"><span class="fa fa-reorder"></span>&nbsp; <b>Changelog</b></a> &nbsp;&nbsp;&nbsp;&nbsp; <a href="download/#installation" class="btn btn-warning" style="margin-bottom:8px;" role="button"><span class="fa fa-gear"></span>&nbsp; <b>Installation</b></a> &nbsp;&nbsp;&nbsp;&nbsp; <a href="examples/usage/" class="btn btn-danger" style="margin-bottom:8px;" role="button"><span class="fa fa-book"></span>&nbsp; <b>Getting Started</b></a>
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