v0.2.2

Fixed

• The 0.2.1 hex package still declared only gpb: it was published
  before the packaging fix landed and could not be replaced. 0.2.2 is
  built with make publish, so it declares livery and h2 and
  installs from hex on its own.

Changed

• make publish PUBLISH_ARGS=--replace passes arguments to
  rebar3 hex publish, to overwrite a version published less than an
  hour ago.