Upgrade to React 16

app/components/LoadingPlaceholder/LoadingPlaceholder.js

@@ -1,26 +1,23 @@
 // @flow
 import React from 'react';
-import ReactCSSTransitionGroup from 'react-addons-css-transition-group';
+import styled from 'styled-components';
+import { fadeIn } from 'shared/styles/animations';
 import Mask from './components/Mask';
 import Flex from 'shared/components/Flex';
 
-export default (props: Object) => {
+export default function LoadingPlaceholder(props: Object) {
   return (
-    <ReactCSSTransitionGroup
-      transitionName="fadeIn"
-      transitionAppearTimeout={0}
-      transitionEnterTimeout={0}
-      transitionLeaveTimeout={0}
-      transitionAppear
-      transitionEnter
-      transitionLeave
-    >
+    <Fade>
       <Flex column auto {...props}>
         <Mask header />
         <Mask />
         <Mask />
         <Mask />
       </Flex>
-    </ReactCSSTransitionGroup>
+    </Fade>
   );
-};
+}
+
+const Fade = styled.span`
+  animation: ${fadeIn} 150ms ease-in-out;
+`;