Update stack.yaml for latest ghc-mod
Update stack.yaml for latest ghc-mod

SAdams601/HaRe,SAdams601/HaRe,RefactoringTools/HaRe,kmate/HaRe,RefactoringTools/HaRe,RefactoringTools/HaRe,kmate/HaRe,kmate/HaRe,SAdams601/HaRe