npm i -g create-react-app@1.5.2

[..................] / rollbackFailedOptional: verb npm-session 8a15f24eef6f3714

npm ERR! code ETIMEDOUT
npm ERR! errno ETIMEDOUT
npm ERR! network request to https://registry.npmjs.org/create-react-app
failed, reason: connect ETIMEDOUT 10.21.30.247:80
npm ERR! network This is a problem related to network connectivity.
npm ERR! network In most cases you are behind a proxy or have bad network settings.
npm ERR! network
npm ERR! network If you are behind a proxy, please make sure that the
npm ERR! network 'proxy' config is set properly.  See: 'npm help config'