Tweak image size
<p align="center">
- <img width="350" height="350" src="https://raw.githubusercontent.com/tomchristie/uvicorn/master/docs/uvicorn.png" alt='uvicorn'>
+ <img width="320" height="320" src="https://raw.githubusercontent.com/tomchristie/uvicorn/master/docs/uvicorn.png" alt='uvicorn'>
</p>
<p align="center">
