add automatic-module name so that it can be used as proper module

[robstoll]

If you build a modular app (https://docs.gradle.org/current/userguide/java_library_plugin.html#sec:java_library_modular) then every library which is not at least an automatic module is a bit of a pain. You can workaround it with something like https://github.com/jjohannes/extra-java-module-info but it would be better if this is not necessary.

Can you please include make spek an automatic module following this guide: https://docs.gradle.org/current/userguide/java_library_plugin.html#sec:java_library_modular_auto thanks