Merge pull request #43 from yaauie/no-overwrite-event-original fix: do not overwrite [event][original] decoded from payload

Fix: json parsing compatibility + freeze event.original value (#38) Pulling in logstash-plugins/logstash-mixin-event_support#3 on top of #37 The desired behavior is to parse `""` as a `nil` and raise no error while doing so (to behave like `Event.from_json` impl). Also added `value.dup.freeze` for `event.original`'s value.

[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 

version 3.0.0 

Bump version Fixes #25

dependency logstash-core-plugin-api ~> 1.0