remove maxAge in README.md
<img src="https://img.shields.io/badge/License-MIT-yellow.svg" alt="License: MIT">
</a>
<a href="https://seladb.github.io/StarTrack-js/#/preload?r=webrtc-rs,webrtc">
- <img src="https://img.shields.io/github/stars/webrtc-rs/webrtc.svg?style=social&label=Star&maxAge=2592000" alt="Github Stars">
+ <img src="https://img.shields.io/github/stars/webrtc-rs/webrtc.svg?style=social&label=Star" alt="Github Stars">
</a>
</p>
<p align="center">
