Update changelog.

CHANGELOG.md

@@ -8,10 +8,18 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
 
 ### Added
 
+- Troubleshooting tips for some runtime crashes due to missing dependencies. (#13)
+- Run actions on a schedule or `workflow_dispatch` as well as pull request and push. (#10)
+- Update actions used in workflows. (#14)
+
 ### Fixed
 
+- Add PySide2 and PyQt5 dependencies to package.xml. (#16)
+
 ### Removed
 
+- Remove version pinning for pycodestyle in workflow. (#15)
+
 ## v0.0.1 - 2021-05-17
 
 Initial release of a ROS2 node and an rqt plugin for visualizing dot graph files.