ChangeLog for v0.12.0
add filter to agent/label hierarchy in comment
Merge pull request #509 from kiyoto/agent-label-diagram

add filter to agent/label hierarchy in comment
fix router is nil inside out_copy, out_roundrobin, and BufferedOutput secondary.
In addition, set default router to be root_agent.event_router to avoid nil error in 3rd party plugins
Merge pull request #508 from fluent/router_out_copy

fix router is nil inside out_copy, out_roundrobin, and BufferedOutput secondary
Use private instead of protected