Include release 0.6.6 on changelog

.travis.yml

@@ -12,6 +12,7 @@
 
 notifications:
   email:
+    if: fork = false AND type = cron
     recipients:
       - manoel@us.ibm.com
     on_success: never

CHANGELOG.md

@@ -15,7 +15,7 @@ Changelog](http://keepachangelog.com/en/1.0.0/).
 > -   **Fixed**: for any bug fixes.
 > -   **Security**: in case of vulnerabilities.
 
-[UNRELEASED](https://github.com/Qiskit/qiskit-aqua/compare/0.6.5...HEAD)
+[UNRELEASED](https://github.com/Qiskit/qiskit-aqua/compare/0.6.6...HEAD)
 ========================================================================
 
 Added
@@ -55,6 +55,15 @@ Fixed
     side of constraints for the DOcplex translator (#750)
 -   WeightedPauliOperator constructor simplification bug (#891)
 
+[0.6.6](https://github.com/Qiskit/qiskit-aqua/compare/0.6.5...0.6.6) - 2020-04-16
+=================================================================================
+
+Removed
+-------
+
+-  Remove backend and PassManager on compiler transpile calls (#882)
+-  Remove transpile calls and use unroller (#883)
+
 [0.6.5](https://github.com/Qiskit/qiskit-aqua/compare/0.6.4...0.6.5) - 2020-03-16
 =================================================================================