Update README.md

Author: uplusware

README.md

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+![openheap](https://raw.githubusercontent.com/uplusware/heaphttpd/master/doc/heaphttpd.png)
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 ## Heaphttpd
 * Lightweight web server with HTTP/1.1 HTTP/2 and HTTPS on Linux.
 * Supports extension, dynamic-link module, cgi/fast-cgi/scgi, php/php-fpm, web.py and WebSocket natively.
 * Support HTTP proxy, HTTPS tunneling, HTTP Reverse/HA proxy and HTTP Load Balancing.
 * Support Asynchronous IO Mode and distributed deployment.
 * Support Service Object (For example, a persistent MariabDB or MongoDB connection)
 * [Project Wiki](https://github.com/uplusware/heaphttpd/wiki/)
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-![openheap](https://raw.githubusercontent.com/uplusware/heaphttpd/master/doc/heaphttpd.png)