updated release notes

Author: matthiaskoenig

release-notes/0.4.0.md

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+# Release notes for sbmlsim 0.4.0
+![sbmlsim logo](https://github.com/matthiaskoenig/sbmlsim/raw/develop/docs/images/favicon/sbmlsim-100x100-300dpi.png)
+
+We are pleased to release the next version of pymetadata including the
+following changes:
+
+## Features & fixes
+* Fixed logging issue (#184)
+* Support for Morris global sensitivity analysis (#179)
+
+Your pymetadata team