Cannot depend on latest version on Java 8

[PikaMug]

README states Java 8 is supported under Requirements. A maven project I manage compiles using 1.9.3-SNAPSHOT just fine, but 1.9.4-SNAPSHOT returns the same "Unsupported class file major version 65" as #328

I decided to compile AnvilGUI locally (with Java 21 as the runner) and the resulting jar works fine as a dependency using <systemPath> scope. Has there maybe been some change to CodeMC that's causing this issue?

Side note: Seems like .mvn/jvm.config may no longer be necessary with the new version of spotless.

[PikaMug]

Decided to send it to Jenkins, same result. Log: https://ci.codemc.io/job/PikaMug/job/MilkGUI/51/console

[mastercake10]

The maven-shade-plugin version in your plugin needs to be at least 3.5.0, i.e.

         <plugins>
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-shade-plugin</artifactId>
                 <version>3.5.3</version>
                 (...)

let me know if this fixes the issue, we need to update the readme then

[PikaMug]

@mastercake10 Thank you, that did the trick! I'll leave this open until one of us PRs the readme.

[WesJD]

updated readme