Update README.md

Author: FoksVHox

README.md

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 # Lua++
-![GitHub tag (latest by date)](https://img.shields.io/github/v/tag/LuaPlusPlus/lua-plus-plus?label=Version&style=plastic)
+![GitHub tag (latest by date)](https://img.shields.io/github/v/tag/LuaPlusPlus/lua-plus-plus?label=Version&style=flat-square)
 <br>Join the [Lua++ Discord](https://discord.gg/wTKbSM)<br>
 The documentation can either be found on the [wiki](https://github.com/LuaPlusPlus/lua-plus-plus/wiki)