docs(README): use 'predictable', not 'clean'
docs(README): use 'predictable', not 'clean'

PR #518
usm4n/cyclejs,usm4n/cyclejs,maskinoshita/cyclejs,cyclejs/cyclejs,cyclejs/cyclejs,ntilwalli/cyclejs,ntilwalli/cyclejs,usm4n/cyclejs,usm4n/cyclejs,ntilwalli/cyclejs,cyclejs/cycle-core,cyclejs/cycle-core,feliciousx-open-source/cyclejs,maskinoshita/cyclejs,feliciousx-open-source/cyclejs,ntilwalli/cyclejs,cyclejs/cyclejs,staltz/cycle,staltz/cycle,feliciousx-open-source/cyclejs,cyclejs/cyclejs,maskinoshita/cyclejs,feliciousx-open-source/cyclejs,maskinoshita/cyclejs