chore(release): 1.6.1 release notes

## [1.6.1](v1.6.0...v1.6.1) (2020-02-04)

### Bug Fixes

* Fix date/datetime_to_string handling of non-date/datetime inputs ([8251b82](8251b82))

Author: semantic-release-bot

CHANGELOG.md

@@ -1,3 +1,10 @@
+## [1.6.1](https://github.com/IBM/python-sdk-core/compare/v1.6.0...v1.6.1) (2020-02-04)
+
+
+### Bug Fixes
+
+* Fix date/datetime_to_string handling of non-date/datetime inputs ([8251b82](https://github.com/IBM/python-sdk-core/commit/8251b820e3a00db855d1960defe75279e3b02515))
+
 # [1.6.0](https://github.com/IBM/python-sdk-core/compare/v1.5.2...v1.6.0) (2019-12-19)