Set sslmode to prefer, otherwise it might fail with clusters that don…

…'t have the new certificate.

Fix getredash#1776: restart was using wrong command on new AMI builds

Bump version.

ADd changelog entry for favicons fix

Fix: handle the case when a scheduled query wasn't run before

Update CHANGELOG.md

Merge pull request getredash#1559 from getredash/new_upgrade

New and shiny upgrade script

Update release date of 0.12.0.

Fix build configuration

Merge pull request getredash#1167 from ariarijp/fix-bootstrap-script-…

…for-ubuntu

Fix the version of setuptools on bootstrap script for Ubuntu