Silverback 0.7.4

Changes

• fix(cluster): use PATCH not PUT for updating a Bot @fubuloubu (#209)
• fix(cli): set environment logic on bot update @fubuloubu (#207)
• refactor(cli): warn about hitting paid limit for bots @fubuloubu (#205)
• fix(cli): clear_environment had bad logic @fubuloubu (#206)
• fix(client): render timezone as local time for logs display @fubuloubu (#204)
• fix(cli): forgot to fix display of update bot in #200 @fubuloubu (#203)
• fix(cli): display warning/raise for unknown variable groups @fubuloubu (#202)
• fix(cli): don't display VarGroupInfo.id (or .created) @fubuloubu (#200)
• feat(cluster): add cluster migration command [Platform only] @fubuloubu (#199)

Special thanks to: @fubuloubu