[Add Changelog] DuckDuckGo privacy browser

Duckduckgo privacy browser doesn't have a changelog link on: https://f-droid.org/fr/packages/com.duckduckgo.mobile.android/

Here it is: https://github.com/duckduckgo/Android/releases

Post related to: https://forum.f-droid.org/t/twif-needs-your-help/4658