request to remove org.jetbrains.annotations.NotNull as a processing dependency

Inside `Base.java` there is `import org.jetbrains.annotations.NotNull;`.
The `@NotNull` is used only once.

I don't know it this made it into the processing source by accident but I think having this is another dependency is not worth it. Specially since it doesn't really add anything that can't be done with vanilla java in a few lines of code.