bump version to v5.0.0-SNAPSHOT
bump version to v5.0.0-SNAPSHOT

Expecting to make breaking changes to commodity model endpoints as unfortunately these didn't make it into v4.0.0.
OpenLMIS/openlmis-referencedata,OpenLMIS/openlmis-referencedata,OpenLMIS/openlmis-referencedata,OpenLMIS/openlmis-referencedata