refactor(http): use xstream v6 as devDependency
refactor(http): use xstream v6 as devDependency

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