Disable webpack cache option in prod (#5877)
Disable webpack cache option in prod (#5877)

* Disable webpack cache option in prod

* Remove cache option as it’s added by mode === ‘development’

JeromeFitz/next.js,flybayer/next.js,azukaru/next.js,BlancheXu/test,zeit/next.js,BlancheXu/test,BlancheXu/test,flybayer/next.js,flybayer/next.js,azukaru/next.js,JeromeFitz/next.js,JeromeFitz/next.js,JeromeFitz/next.js,zeit/next.js,azukaru/next.js,azukaru/next.js,zeit/next.js,flybayer/next.js