JCenter shutdown: Publish to Maven Central

[Kai-Z-JP]

JCenter will be permanent shutdown in February 2022. (https://jfrog.com/blog/into-the-sunset-bintray-jcenter-gocenter-and-chartcenter/)

It would be great if you could publish java-express to Maven Central or other Maven Repo.

[pcleddy]

Ditto, things not "just working".

Also, please update the Readme to reflect how to get the code compiled, i.e. which IDE or build tool was used. Unless above fix makes things just work again.

I tried a number of things, none worked. Reverting to 0.1.1 worked with "gradle build", so maybe just revert.

[masecla22]

Hello! I forked this project, and ended up fixing this issue on my end by switching to Maven and moving to Jitpack. You can check it out: https://github.com/masecla22/java-express If the same issue happens on my end too, feel free to open an issue there too.