Bumped upper version constraint for heist in project template.
Bumped upper version constraint for heist in project template.

sopvop/snap-core,snapframework/snap-core,sopvop/snap-core,sopvop/snap-core,snapframework/snap-core,23Skidoo/snap-core,23Skidoo/snap-core,f-me/snap-core,f-me/snap-core,23Skidoo/snap-core,snapframework/snap-core,f-me/snap-core