chore: Upgrade flow (#1854)

* wip: upgrade flow

* chore: More sealed props improvements

* Final fixes

app/components/Labeled.js

@@ -4,10 +4,10 @@ import * as React from "react";
 import styled from "styled-components";
 import Flex from "components/Flex";
 
-type Props = {
+type Props = {|
   label: React.Node | string,
   children: React.Node,
-};
+|};
 
 const Labeled = ({ label, children, ...props }: Props) => (
   <Flex column {...props}>