Merge pull request #19 from karenzone/ecs-doc Doc: Add ECS compatibility info

Feat: ECS + event_factory support (#18) Co-authored-by: Ry Biesemeyer <yaauie@users.noreply.github.com>

bump to version 3.0.8 

bump to version 3.0.7 

bump version to 3.0.6 

[skip ci] update gemspec summary 

Version bump For elastic/logstash#7993 [ci skip]

bump patch level for doc generation 

dependency logstash-core-plugin-api >= 1.60 <= 2.99 

Make sure all the gems were published under jruby