Enable Flow Strict

src/components/Sidebar/Copyright/Copyright.js

@@ -1,4 +1,4 @@
-// @flow
+// @flow strict
 import React from 'react';
 import styles from './Copyright.module.scss';
 
@@ -12,4 +12,4 @@ const Copyright = ({ copyright }: Props) => (
   </div>
 );
 
-export default Copyright;
+export default Copyright;

src/components/Sidebar/Copyright/Copyright.test.js

@@ -1,4 +1,4 @@
-// @flow
+// @flow strict
 import React from 'react';
 import renderer from 'react-test-renderer';
 import Copyright from './Copyright';

src/components/Sidebar/Copyright/index.js

@@ -1,2 +1,2 @@
-// @flow
+// @flow strict
 export { default } from './Copyright';