Prepare 1.6.7 release

Author: MarioBlazek

doc/CHANGELOG.md

@@ -6,6 +6,11 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](http://keepachangelog.com/)
 and this project adheres to [Semantic Versioning](http://semver.org/).
 
+## [1.6.7] - 2019-04-16
+### Fixed
+- Legacy controller should also handle captcha errors
+- Check if DateAndTime and Date are null before using them
+
 ## [1.6.6] - 2019-03-05
 ### Added
 - Export all functionality - tnx @ludwig031