Fix: Update the import of redux-thunk

The default export has been removed as of v3.1.0 and now there are
named exports.

src/web/store/index.js

@@ -18,7 +18,7 @@
 
 import {createStore, applyMiddleware} from 'redux';
 
-import thunk from 'redux-thunk';
+import {thunk} from 'redux-thunk';
 
 import {createLogger} from 'redux-logger';