Upgrade to cabal2nix-2.11. Should fix #117

Author: nh2

stack.yaml

@@ -4,7 +4,9 @@ packages:
 - '.'
 
 extra-deps:
-- cabal2nix-2.10.0
+- cabal2nix-2.11
+- hpack-0.29.6 # dependency of cabal2nix-2.10.0
+- infer-license-0.2.0 # dependency of hpack-0.29.6
 
 nix:
   packages: [zlib,gmp,git,pcre,openssl]

stack2nix.cabal

@@ -22,7 +22,7 @@ library
   build-depends:       base >=4.9 && <4.12
                      , Cabal >= 2.0.0.2 && < 2.3
                      , async >= 2.1.1.1 && < 2.3
-                     , cabal2nix >= 2.10 && < 2.11
+                     , cabal2nix >= 2.11 && < 2.12
                      , containers >= 0.5.7.1 && < 0.6
                      , directory >= 1.3 && < 1.4
                      , distribution-nixpkgs >= 1.1 && < 1.2