Fix cabal build

Set optparse-applicative < 0.13, since 0.13 introduced breaking changes

lambda-calculator.cabal

@@ -36,7 +36,7 @@ executable lambda-calculator
   ghc-options:         -threaded -rtsopts -with-rtsopts=-N
   build-depends:       base,
                        lambda-calculator,
-                       optparse-applicative,
+                       optparse-applicative < 0.13,
                        Shellac,
                        Shellac-readline
   default-language:    Haskell2010

stack.yaml

@@ -5,4 +5,4 @@ packages:
 extra-deps:
 - Shellac-0.9.9
 - Shellac-readline-0.9.9
-resolver: lts-7.0
+resolver: lts-7.14