Freezing this repo

[toshitanian]

I'm thinking of freezing this repo as upstream is supporting features that we tried to support.
Thank you @cosmo0920

[cosmo0920]

np. We should notify users to reccomend to use upstream plugin.
i'll add deprecated notification item into: https://github.com/fluent/fluentd-website/blob/master/scripts/obsolete-plugins.yml

[cosmo0920]

I've reported about this in fluent/fluentd-website#84.