chore(package): update cross-env to version 3.0.0
chore(package): update cross-env to version 3.0.0

https://greenkeeper.io/
progre/nginx-rtmp-frontend,progre/template-typescript,progre/nrf,progre/youtubeuploader,progre/chatreader,progre/chatreader,progre/template-typescript,progre/nrf,progre/nginx-rtmp-frontend,progre/typescript-boilerplate,progre/youtubeuploader,progre/nginx-rtmp-frontend,progre/typescript-boilerplate,progre/template-typescript,progre/nrf,progre/youtubeuploader,progre/typescript-boilerplate,progre/chatreader