Metabase 0.19.1

Bug Fixes

#3112 - Enable Metabot toggle not working in admin slack settings
#3096 - Can't add dashboard level filter
#3090 - CSV downloads don't respect SQL variables/parameters
#3095 - Strange behaviour with single series line chart

Complete list of issues -
https://github.com/metabase/metabase/issues?q=milestone%3A0.19.1+is%3Aclosed