Added requirements.txt to pip install step
Added requirements.txt to pip install step

tomalrussell/smif,tomalrussell/smif,willu47/smif,nismod/smif,nismod/smif,willu47/smif,willu47/smif,tomalrussell/smif,nismod/smif,willu47/smif,nismod/smif,tomalrussell/smif