update the updator, add mc 1.21, bump to version 0.7.9

Added self updating support (through github releases)

Merge branch 'main' of https://github.com/RiversideValley/Emerald

Merge branch 'main' of https://github.com/RiversideValley/Emerald

bugFix

update readme

BugFix

Update README.md

Mod Store

Finally, I did it!

Merge pull request #3 from SeaDevTeam/0.4.3

version 0.4.3 beta