React.PropTypes is deprecated in React@15.5

Now there are warnings from redux-router.

> Warning: Accessing PropTypes via the main React package is deprecated, and will be removed in React v16.0. Use the latest available v15.* prop-types package from npm instead. For info on usage, compatibility, migration and more, see https://fb.me/prop-types-docs

Find where redux-router uses React.PropTypes, likely in component files. Replace those imports with the separate 'prop-types' package. Check the project's dependencies to see if prop-types is already included, and update import statements accordingly. Verify the fix by running any existing tests or checking that the warning disappears.

索引モデルが issue の本文から書いたものです。