fix(ObserveViewport): fix server side rendering

Using default it was working on the client, using non default it was working
on the server. No method worked on both. This should fix it for now.

Author: Jannick Garthen

lib/ObserveViewport.tsx

@@ -1,5 +1,7 @@
 import * as React from 'react';
-const memoize = require('memoize-one').default;
+const memoizeOne = require('memoize-one');
+const memoize =
+  typeof memoizeOne === 'function' ? memoizeOne : memoizeOne.default;
 const raf = require('raf');
 
 import { shallowEqualScroll, shallowEqualDimensions } from './utils';