mini Vector

Jan 1, 2019

Corresponding to upstream release 0.8.20.
Detailed change log: https://github.com/LiMium/mini-vector-android/blob/limified/CHANGES.rst

Improvements:
Remove double negations from settings and update descriptions
Handle missing or bad parameter in slash command
Support specifying kick and ban message
Add image transparency and fix issues with gifs in the media viewer
Make User Agreement part of the registration flow

and many fixes.