set default_codec doc attribute

[skip ci] update gemspec summary

Version bump

For elastic/logstash#7993

[ci skip]

bump patch level for doc generation

Merge pull request #12 from logstash-plugins/fix/10

Make this compatible with LS 5.x

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

bump to 3.0.2 and update changelog

Fixes #7

bump to 2.0.5

Fixes #9

Make sure all the gems were published under jruby

version 3.0.0