1.0.0-M5

This release brings parity with Milestone 5 of the JUnit Platform. The plugin attempts to further bridge the gap between inconsistencies with bundled versions of JUnit 5 inside IntelliJ IDEA and Android Studio, trying to prevent these nasty NoSuchMethodErrors when the IDE expects an older milestone at runtime. Otherwise, it's mostly structural niceties which allow for automatic deployment. Also: Snapshots!