chore: Update shadow section in README

Author: phinner

README.md

@@ -12,12 +12,10 @@ Get your Mindustry plugin started with this awesome template repository, it feat
 
 - [Indra](https://plugins.gradle.org/plugin/net.kyori.indra) Gradle plugin for easier java development.
 
-- Bundling and automatic relocation with the [Shadow](https://imperceptiblethoughts.com/shadow/) gradle plugin.
+- Bundling and automatic relocation with the [Shadow](https://gradleup.com/shadow/) gradle plugin.
 
   - Unused classes are removed from the final jar.
 
-  - **NOTE:** shadow is no longer maintained, it has been replaced by a [fork](https://github.com/Goooler/shadow) from one of the major contributors.
-
 - A `CHANGELOG.md` file that will be updated automatically when you create a release on GitHub.
 
 ## How to use