fix(package): add missing dev dependency mkdirp
fix(package): add missing dev dependency mkdirp

feliciousx-open-source/cyclejs,feliciousx-open-source/cyclejs,feliciousx-open-source/cyclejs,cyclejs/cyclejs,cyclejs/cycle-core,maskinoshita/cyclejs,feliciousx-open-source/cyclejs,cyclejs/cyclejs,usm4n/cyclejs,maskinoshita/cyclejs,ntilwalli/cyclejs,usm4n/cyclejs,ntilwalli/cyclejs,ntilwalli/cyclejs,maskinoshita/cyclejs,staltz/cycle,maskinoshita/cyclejs,cyclejs/cyclejs,cyclejs/cyclejs,usm4n/cyclejs,cyclejs/cycle-core,ntilwalli/cyclejs,staltz/cycle,usm4n/cyclejs