fixing markdown in README

README.md

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 [![MattermostChat](https://img.shields.io/badge/Chat-Mattermost-blueviolet.svg)](https://mattermost.kg6wxc.net)  
 <h1 style="float: left; vertical-align: middle;">MeshMap</h1>
 Automated mapping of AREDN Networks.  
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 2016-2019 - Eric Satterlee / KG6WXC  
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 Addtional Credit to: Mark/N2MH and Glen/K6GSE for their work on this project.  
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 Licensed under GPL v3 and later.  
 [Donations](https://www.paypal.com/cgi-bin/webscr?cmd=_donations&business=6K5KQYYU34H4U&currency_code=USD&source=url) / Beer accepted! :)