statsd decrement counter

[littlebee]

Hi! I need a counter that can be incremented and decremented across multiple processes and vms. It looks like datadog & statsd supports this (https://www.rubydoc.info/github/DataDog/dogstatsd-ruby/Datadog%2FStatsd:decrement)

It also looks like someone implemented this support for sementio/stats (4270b1b) and it was tagged as part of v4.4.1, but I don't see any signs of it in master or in the v4.4.1 of segmentio/stats that I have locally.

Thanks in advance for the assist!