release: update changelog to 1.4.0-2 version
release: update changelog to 1.4.0-2 version

Former-commit-id: 59cacf6bc7cadb45c8028b5219fa80afec18b903 [formerly 2c2fb22e572040ca7f1f45a4ec6120ff361146e5]
Former-commit-id: 03b2a42fbe7644e37910a9e261e1327160cb77ce
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine