Update README.md

[Boomer-1]

Description

updating the readme to show the current version cap of 1.20.4

Proposed changes

simply changing 1.20.x to read 1.20.4 until we update to the latest version

Related Issues (if applicable)

Checklist

• [x ] I have fully tested the proposed changes and promise that they will not break everything into chaos.
• I have also tested the proposed changes in combination with various popular addons and can confirm my changes do not break them.
• I have made sure that the proposed changes do not break compatibility across the supported Minecraft versions (1.16.* - 1.20.*).
• [ x] I followed the existing code standards and didn't mess up the formatting.
• I did my best to add documentation to any public classes or methods I added.
• I have added Nonnull and Nullable annotations to my methods to indicate their behaviour for null values
• I added sufficient Unit Tests to cover my code.

[github-actions]

Pro Tip!
You can help us label your Pull Requests by using the following branch naming convention next time you create a pull request. ❤️

Branch naming convention	Label
feature/**	🎈 Feature
fix/**	✨ Fix
chore/**	🧹 Chores
api/**	🔧 API
performance/**	💡 Performance Optimization
compatibility/**	🤝 Compatibility

---

If your changes do not fall into any of these categories, don't worry. You can just ignore this message in that case! 👀

[Alessio-Colombo]

It's been hanging for so long that at this point we might as well correct it I guess

[ybw0014]

need to change a line of code to make CI check pass

[Alessio-Colombo]

Wait, you mean a line of the source code, right?

[ybw0014]

yeah a line of the source code

[github-actions]

Slimefun preview build

A Slimefun preview build is available for testing!
Commit: cc53a8c

https://preview-builds.walshy.dev/download/Slimefun/4222/cc53a8c1

Note: This is not a supported build and is only here for the purposes of testing.
Do not run this on a live server and do not report bugs anywhere but this PR!

[ybw0014]

This can be closed when #4186 is merged.

[ybw0014]

this can be closed

[WalshyDev]

Ez