doc: update changelog for v0.4.0

Author: nodiscc

docs/changelog.rst

@@ -9,6 +9,16 @@ The format is based on `Keep a Changelog`_ and this project adheres to
 .. _Keep A Changelog: http://keepachangelog.com/
 .. _Semantic Versioning: http://semver.org/
 
+`v0.4.0 <https://github.com/shaarli/python-shaarli-client/releases/tag/v0.3.0>`_ - 2020-01-09
+---------------------------------------------------------------------------------------------
+
+**Added:**
+
+* CLI:
+
+  * Add support for ``--insecure`` option (bypass SSL certificate verification)
+
+
 `v0.3.0 <https://github.com/shaarli/python-shaarli-client/releases/tag/v0.3.0>`_ - 2019-02-23
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