update changelog for v1.0.3

Signed-off-by: Federico Vaga <federico.vaga@cern.ch>

CHANGELOG.rst

@@ -9,6 +9,12 @@ Change Log
 Format: `Keep a Changelog <https://keepachangelog.com/en/1.0.0/>`_
 Versioning: `Semantic Versioning <https://semver.org/spec/v2.0.0.html>`_
 
+[1.0.3] - 2020-01-15
+====================
+Changed
+-----
+- [sw] add more file to .gitignore
+
 [1.0.2] - 2019-10-24
 ====================
 Fixed