Remove references to LPG's patreon (#744)

Given that LPG is not maintaining Rojo or its related projects, it does
not make sense for us to suggest his patreon. This PR removes them.

README.md

@@ -8,7 +8,6 @@
     <a href="https://github.com/rojo-rbx/rojo/actions"><img src="https://github.com/rojo-rbx/rojo/workflows/CI/badge.svg" alt="Actions status" /></a>
     <a href="https://crates.io/crates/rojo"><img src="https://img.shields.io/crates/v/rojo.svg?label=latest%20release" alt="Latest server version" /></a>
     <a href="https://rojo.space/docs"><img src="https://img.shields.io/badge/docs-website-brightgreen.svg" alt="Rojo Documentation" /></a>
-    <a href="https://www.patreon.com/lpghatguy"><img src="https://img.shields.io/badge/sponsor-patreon-red" alt="Patreon" /></a>
 </div>
 
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