update changelog

Author: chrisjsewell

README.md

@@ -1,8 +1,8 @@
 # pytest-notebook
 
-[![Build Status](https://travis-ci.org/chrisjsewell/pytest-notebook.svg?branch=master)](https://travis-ci.org/chrisjsewell/pytest-notebook)
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docs/source/changelog.rst

@@ -2,6 +2,14 @@ Changelog
 =========
 
 
+v0.6.0 (2019-08-13)
+-------------------
+- Add Coverage Functionality (#3) [Chris Sewell]
+
+  An ``ExecuteCoveragePreprocessor`` class has been implemented,
+  and integrated into the ``NBRegressionFixture`` and ``pytest_notebook.plugin``.
+  Also, tests and a tutorial have been added.
+
 v0.5.2 (2019-08-12)
 -------------------
 - Add documentation for beautifulsoup post-processor. [Chris Sewell]