20190815.0

What's Changed

• Add support for options flows (#3491) @balloob
• Refactor config flow dialog to make it reusable (#3488) @balloob
• Upgrade MDI icons to 4.0.96 (#3490) @bonanitech
• Upgrade lit-html (#3485) @balloob
• Do not use toggleAttribute (#3484) @balloob
• Fix ha-sidebar for RTL (#3469) @yosilevy
• RTL arrow problems (#3467) @yosilevy
• Add relevant device_class icons for Cover entity (#3482) @sebr