Support GHC 8.6

Author: rvl

nix-tools.cabal

@@ -18,7 +18,7 @@ library
                      , Cabal2Nix.Util
                      , Cabal2Nix.Plan
                      , Distribution.Nixpkgs.Fetch
-  build-depends:       base >=4.11 && <4.12
+  build-depends:       base >=4.11 && <4.13
                      , hnix >= 0.5.0
                      , aeson
                      , unordered-containers
@@ -40,7 +40,7 @@ library
 executable cabal-to-nix
   ghc-options:         -Wall
   main-is:             Main.hs
-  build-depends:       base >=4.11 && <4.12
+  build-depends:       base >=4.11 && <4.13
                      , transformers
                      , bytestring
                      , hpack
@@ -56,7 +56,7 @@ executable cabal-to-nix
 executable hashes-to-nix
   ghc-options:         -Wall
   main-is:             Main.hs
-  build-depends:       base >=4.11 && <4.12
+  build-depends:       base >=4.11 && <4.13
                      , hnix >= 0.5.0
                      , nix-tools
                      , data-fix
@@ -72,7 +72,7 @@ executable hashes-to-nix
 executable plan-to-nix
   ghc-options:         -Wall
   main-is:             Main.hs
-  build-depends:       base >=4.11 && <4.12
+  build-depends:       base >=4.11 && <4.13
                      , nix-tools
                      , hnix >= 0.5.0
                      , text
@@ -87,7 +87,7 @@ executable plan-to-nix
 executable hackage-to-nix
   ghc-options:         -Wall
   main-is:             Main.hs
-  build-depends:       base >=4.11 && <4.12
+  build-depends:       base >=4.11 && <4.13
                      , nix-tools
                      , hackage-db
                      , hnix
@@ -106,7 +106,7 @@ executable hackage-to-nix
 executable lts-to-nix
   ghc-options:         -Wall
   main-is:             Main.hs
-  build-depends:       base >=4.11 && <4.12
+  build-depends:       base >=4.11 && <4.13
                      , nix-tools
                      , hnix >= 0.5.0
                      , yaml
@@ -124,7 +124,7 @@ executable lts-to-nix
 executable stack-to-nix
   ghc-options:         -Wall
   main-is:             Main.hs
-  build-depends:       base >=4.11 && <4.12
+  build-depends:       base >=4.11 && <4.13
                      , nix-tools
                      , transformers
                      , hnix >= 0.5.0