Add rudimentary changelog

Author: kdm9

CHANGELOG.md

@@ -0,0 +1,8 @@
+# Version 0.9.0 (2022-12-17)
+
+- Support for progress bars, and display and updating of HTML/JS content. Thanks to @janpfeifer (https://github.com/takluyver/bash_kernel/pull/122)
+- Add a Binder template/config (thanks @mwouts)
+
+# Version 0.8.0 (2022-08-22)
+
+- Fixes for modern GNU readline. Solves longstanding bug rendering bash_kernel inoperable (@kdm9 https://github.com/takluyver/bash_kernel/pull/120).