issue regarding macrocache on 0.3.0
Hi, 
I'm just starting to play with nim. 

When I compiler with expamle.nim, if I'm using jester 0.3.0, it always said .nimble/pkgs/jester-0.3.0/jester.nim(5, 38) Error: cannot open 'macrocache'

compare with 0.2.1 and 0.3.0. macrocache seems new in 0.3.0. I didn't see macrocache is one of the package in the nim package.json. would you please give a hint?

Thanks