Is your feature request related to a problem? Please describe.
I really prefer to read the changelog of every addon before I update it so I know what is actually changing.

Describe the solution you'd like
I can think of a few different ways this could be done. I'll list them in my preferred order, but happy for your expertise

1. If an update is available, when you click on the Remote version number the changelog will display in the expanded window
2. When you click on the addon name or remote version number the changelog will also show up underneath the summary
3. When you click on the addon name a Changelog button next to the other buttons (Force update/Ignore/Delete) that when clicked will bring a popup or expand further to show the changelog.
4. When you click on the addon name a Changelog button next to the other buttons (Force update/Ignore/Delete) that when clicked will load the changelog/addon website in your selected browser

Describe alternatives you've considered
N/A