Upgrade to Flow 0.71

app/components/ScrollToTop.js

@@ -1,9 +1,9 @@
 // @flow
 // based on: https://reacttraining.com/react-router/web/guides/scroll-restoration
-import { Component } from 'react';
+import * as React from 'react';
 import { withRouter } from 'react-router-dom';
 
-class ScrollToTop extends Component {
+class ScrollToTop extends React.Component<*> {
   componentDidUpdate(prevProps) {
     if (this.props.location !== prevProps.location) {
       window.scrollTo(0, 0);