Changing 'bob' references to 'hamming' in hamming/GETTING_STARTED.md

Not sure if hamming/GETTING_STARTED.md was intended to be more of a template, or to specifically call out the hamming exercise.  Assuming the latter I've updated the references to 'bob' with 'hamming'.  (Probably) paradoxically I've left the ```test_stating_something``` method and ```"Whatever"``` text as they are -- if this pr is on the right track you may want to clean those up (I'm happy to help).