fix off by 1 in pymc3 (issue 338)
fix off by 1 in pymc3 (issue 338)

ifduyue/Probabilistic-Programming-and-Bayesian-Methods-for-Hackers,aitatanit/Probabilistic-Programming-and-Bayesian-Methods-for-Hackers,ifduyue/Probabilistic-Programming-and-Bayesian-Methods-for-Hackers,CamDavidsonPilon/Probabilistic-Programming-and-Bayesian-Methods-for-Hackers,ifduyue/Probabilistic-Programming-and-Bayesian-Methods-for-Hackers,CamDavidsonPilon/Probabilistic-Programming-and-Bayesian-Methods-for-Hackers,CamDavidsonPilon/Probabilistic-Programming-and-Bayesian-Methods-for-Hackers,aitatanit/Probabilistic-Programming-and-Bayesian-Methods-for-Hackers,aitatanit/Probabilistic-Programming-and-Bayesian-Methods-for-Hackers