Fix Premake logo in README
<p align="center">
- <a href="https://premake.github.io/" target="blank"><img src="https://premake.github.io/premake-logo.png" height="200" width="200" alt="Premake" /></a>
+ <a href="https://premake.github.io/" target="blank"><img src="https://premake.github.io/img/premake-logo.png" height="200" width="200" alt="Premake" /></a>
</p>
<p align="center">
