update to 0.9-beta6 language in install guide
update to 0.9-beta6 language in install guide

eyeseast/tarbell,eads/tarbell,eyeseast/tarbell,NUKnightLab/tarbell,tarbell-project/tarbell,eads/tarbell,NUKnightLab/tarbell,NUKnightLab/tarbell,tarbell-project/tarbell