updated changelog for release 1.3 new features
updated changelog for release 1.3 new features


Former-commit-id: a7fdff8b95323c15397ff058ff53ab7204e519da [formerly 15f3a0c502b608bc6074fbdf82d51de449719897]
Former-commit-id: 10b174bb9d52bc7fe0ba0050d14f86a1d26338ce
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine