refactor(xstream-adapter): update xstream devDep to v7.0
refactor(xstream-adapter): update xstream devDep to v7.0

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