Fix typo in ch1 
Fix typo in ch1 

`for a code with no bugs` -> `for code with no bugs`
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,CamDavidsonPilon/Probabilistic-Programming-and-Bayesian-Methods-for-Hackers,ifduyue/Probabilistic-Programming-and-Bayesian-Methods-for-Hackers,ifduyue/Probabilistic-Programming-and-Bayesian-Methods-for-Hackers,aitatanit/Probabilistic-Programming-and-Bayesian-Methods-for-Hackers,ifduyue/Probabilistic-Programming-and-Bayesian-Methods-for-Hackers