chore(package): update cross-env to version 4.0.0 (#1572)
chore(package): update cross-env to version 4.0.0 (#1572)

https://greenkeeper.io/
arunoda/next.js,BlancheXu/test,callumlocke/next.js,JeromeFitz/next.js,kevmannn/next.js,zeit/next.js,nelak/next.js,BlancheXu/test,kpdecker/next.js,flybayer/next.js,azukaru/next.js,zeit/next.js,flybayer/next.js,dizlexik/next.js,zeit/next.js,azukaru/next.js,flybayer/next.js,JeromeFitz/next.js,flybayer/next.js,nahue/next.js,JeromeFitz/next.js,giacomorebonato/next.js,JeromeFitz/next.js,azukaru/next.js,BlancheXu/test,azukaru/next.js