Is your feature request related to a problem? Please describe.

Often when addon developers make changes in an update, many users are not even aware of it. Users usually read the documentation when they install a new addon but not every time they update it. Also, it would be tedious to read the entire documentation every time. Change information may be available on Github, on the addons website or on the mailing lists but not all users access it, maybe because they update via addonUpdater.

Describe the solution you'd like

• Developers could include a changelog.md file in the doc folder of the addon.
• set a button in the addon manager, next to the "addon help" button, to show the changelog file.
• Set a button in the addon install dialog, when you are informed that there is already a version installed,to view the change log before updating it.

Describe alternatives you've considered

• Any other way you can think of to display the change log in an easily accessible way for the user.

Additional context