v0.7.0 / 2018-08-22

This is a breaking release, but the migration is easy: command line flags now
require two dashes (--help instead of -help). The previous flag library
already accepts this form, so if necessary you can migrate the flags first
before upgrading.

The deprecated --statsd.listen-address flag has been removed, use
--statsd.listen-udp instead.

• [CHANGE] Switch to Kingpin for flags, fixes setting log level (#141)
• [IMPROVEMENT] Allow matching on specific metric types (#136)
• [IMPROVEMENT] Summary quantiles can be configured (#135)
• [BUGFIX] Fix panic if an invalid regular expression is supplied (#126)