add wakatime badge

README.md

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 <h1 align="center">Akane</h1>
 <div align="center">The Nim asynchronous web framework.
 
+[![wakatime](https://wakatime.com/badge/github/Ethosa/akane.svg)](https://wakatime.com/badge/github/Ethosa/akane)
 [![Open Source Love](https://badges.frapsoft.com/os/v1/open-source.png?v=103)](https://github.com/ellerbrock/open-source-badges/)
 [![Nim language-plastic](https://github.com/Ethosa/yukiko/blob/master/nim-lang.svg)](https://github.com/Ethosa/yukiko/blob/master/nim-lang.svg)
 [![License](https://img.shields.io/github/license/Ethosa/akane)](https://github.com/Ethosa/akane/blob/master/LICENSE)