add dev dependencies for building docs
add dev dependencies for building docs

vezzi/TACA,SciLifeLab/TACA,SciLifeLab/TACA,SciLifeLab/TACA,guillermo-carrasco/TACA,b97pla/TACA,guillermo-carrasco/TACA,senthil10/TACA,vezzi/TACA,b97pla/TACA,senthil10/TACA,kate-v-stepanova/TACA,kate-v-stepanova/TACA