Fix: incorrect syslog (priority) field name (logstash-plugins#303)

+ Test: handle compatibility with JRuby 9.2.15.0
+ Fix: missed `ciscotag` ECS-ification for CISCO_TAGGED_SYSLOG

Feat: fully ECS compliant captures (logstash-plugins#297)

The joint effort of pattern captures ECS-ification (logstash-plugins#278)

Additionally also includes: logstash-plugins#298, logstash-plugins#299, logstash-plugins#273

resolves logstash-plugins#278
fixes logstash-plugins#248 fixes logstash-plugins#258 closing logstash-plugins#243 fixes logstash-plugins#233 closing logstash-plugins#173

[skip ci] update travis ci badge from .org to .com

version bump for some docs fixes

bump patch level for doc generation

bump to 4.1.0

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

Make sure the plugins 2.0 feature branch is merged into this plugin

version 4.0.0

bump version to 2.0.5