update changelog for 0.22.0 release (engine-2.2)
update changelog for 0.22.0 release (engine-2.2)

gem/oq-engine,gem/oq-hazardlib,gem/oq-engine,gem/oq-engine,gem/oq-hazardlib,gem/oq-engine,gem/oq-engine,gem/oq-hazardlib