Update changelog

CHANGELOG.md

@@ -18,14 +18,35 @@ Changelog](http://keepachangelog.com/en/1.0.0/).
 [UNRELEASED](https://github.com/Qiskit/qiskit-aqua/compare/0.6.5...HEAD)
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+Added
+-----
+
+-   Algorithm interface and result classes (#849) 
+-   Chemistry FCIDump file driver (#859)
+-   Chemistry stack automatic Z2 symmetry reduction (#870)
+
 Changed
 -------
 
--   Remove declarative api (#758) (#759) (#760) (#762) (#763)
+-   Logical expression oracle improvements (#821)
 -   Refactor Multiclass Extensions to set Estimator internally (#822)
--   Refactor algorithms (#831)
+-   Refactor algorithms (#831) (#849)
+-   Classical algorithms renamed, former names deprecated (#851)
+-   Chemistry process algorithm result returns result object, lines, dict return deprecated (#861)
+-   Measurement error mitigation supports different output orders on same qubits (#865)
+
+Removed
+-------
+
+-   Declarative api (#758) (#759) (#760) (#762) (#763)
 -   Moved to Terra: multi-controlled Toffoli, U1 and Pauli rotation gates (including tests) (#833)
 
+Fixed
+-----
+
+-   Boolean logic circuit construction (#819)
+-   Measurement on actual devices for Amplitude Estimation algorithms (#841) (#842)
+
 [0.6.5](https://github.com/Qiskit/qiskit-aqua/compare/0.6.4...0.6.5) - 2020-03-16
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