Remove reference to ./css.js from npm files list (#5179)
Remove reference to ./css.js from npm files list (#5179)

./css.js has been removed with [e093441](https://github.com/zeit/next.js/commit/e093441bad588e98765a05df90f76f75283eda07#diff-b9cfc7f2cdf78a7f4b91a753d10865a2)
JeromeFitz/next.js,JeromeFitz/next.js,azukaru/next.js,flybayer/next.js,azukaru/next.js,BlancheXu/test,zeit/next.js,zeit/next.js,flybayer/next.js,azukaru/next.js,BlancheXu/test,JeromeFitz/next.js,flybayer/next.js,BlancheXu/test,JeromeFitz/next.js,zeit/next.js,flybayer/next.js,azukaru/next.js