Fix npm publish deprecations

[kratsg]

npm WARN prepublish-on-install As of npm@5, `prepublish` scripts are deprecated.
npm WARN prepublish-on-install Use `prepare` for build steps and `prepublishOnly` for upload-only.
npm WARN prepublish-on-install See the deprecation note in `npm help scripts` for more information.

> [email protected] prepublish .
> npm run transpile


> [email protected] transpile /Users/kratsg/a11y-react-redux-router
> rimraf dist && babel src -d dist

src/lib/index.js -> dist/lib/index.js
npm ERR! publish Failed PUT 403
npm ERR! code E403
npm ERR! Package name triggered spam detection; if you believe this is in error, please contact [email protected] : a11y-react-redux-router

npm ERR! A complete log of this run can be found in:
npm ERR!     /Users/kratsg/.npm/_logs/2018-02-27T03_24_27_133Z-debug.log