add versions to requirements.txt
add versions to requirements.txt

plumps/luftqualitaet_sachsen,CodeforLeipzig/luftqualitaet_sachsen,CodeforLeipzig/luftqualitaet_sachsen,plumps/luftqualitaet_sachsen,CodeforLeipzig/luftqualitaet_sachsen,CodeforLeipzig/luftqualitaet_sachsen