v8.0.0

v7.1.0

connect React Context API to redux DevTools (also works for a React-Native app) for dev only.

upgrade to React 16.3.x
upgrade to webpack 4
upgrade to react-hot-loader v4
drop CSS Module in favor of styled-components (scoped style, theme support, better scaling in huge applications, simplify toolchain and keep nearly SASS syntax)
add flow types (even a little typing at least for better dev experience)
drop prop-types(static and dynamic typing apart, flow type does far more so avoid writing 2 differents typing system)
workbox-webpack-plugin (service worker caching powerful tool from Google)
loadable-components (split your code: here splitted just by routes, by you can split a component level if you feel the need)
webpack-bundle-analyzer: analyze your bundle size (maybe you should split or lazy load some part of your application: you will see clearly how to fix that)
drop moment for date-fns (since far smaller size and job's done)

upgrade to React 16.x
react-router 4+ (read this nice article about migrating from react-router 3 to react-router 4)
add few flow types (still keep propTypes)
updated hot reload (read hot reload starter)
use CSS module (keep coding style with SASS but get benefit of css module for a more peasant coding)

If you prefer a webpack 1 version, version 1.1.0 is what you are looking for.