Upgrade to emotion v10

Summary: React 16 is not compatible with react-emotion 9 (it prints warnings, see also https://github.com/emotion-js/emotion/issues/644). So we should upgrade to 10.

Reviewed By: mweststrate

Differential Revision: D18905889

fbshipit-source-id: c00d2dbbadb1c08544632cb9bfcd63f2b1818a25

src/ui/components/Checkbox.tsx

@@ -8,7 +8,7 @@
  */
 
 import {PureComponent} from 'react';
-import styled from 'react-emotion';
+import styled from '@emotion/styled';
 import React from 'react';
 
 type CheckboxProps = {
@@ -18,7 +18,7 @@ type CheckboxProps = {
   onChange: (checked: boolean) => void;
 };
 
-const CheckboxContainer = styled('input')({
+const CheckboxContainer = styled.input({
   display: 'inline-block',
   marginRight: 5,
   verticalAlign: 'middle',