Create empty assets/ dir
Create empty assets/ dir

Thanks @smcdougall, see https://github.com/picocms/Pico/commit/3f988961659a5650b3e8918b36bb288cd9aa7878#commitcomment-22043296

PhrozenByte/Pico,TakamiChie/Pico,picocms/Pico,TakamiChie/Pico,picocms/Pico,PhrozenByte/Pico,PhrozenByte/Pico,picocms/Pico,TakamiChie/Pico,TakamiChie/Pico