Update react-redux to 6.0.0-beta.2, enable react concurrent mode, use strict equality mapState checks

client/src/js/utils/connect.js

@@ -0,0 +1,13 @@
+import { connect } from 'react-redux';
+
+const strictEqual = (a, b) => a === b;
+
+export default (mapState, mapDispatch) =>
+  connect(
+    mapState,
+    mapDispatch,
+    null,
+    {
+      areStatePropsEqual: strictEqual
+    }
+  );