Support latest base, containers and contravariant major versions (#108)

Author: ocharles

Changelog.md

@@ -50,6 +50,13 @@
 
 * Export `prelude.types.Scopes`.
 
+## Other Changes
+
+* Bump upper-bounds for `base`, `containers` and `contravariant`. This project
+  can build on GHC 8.6 (though will need `--allow-newer` for `Cabal` until this
+  is official released).
+
+
 ## 1.1.0.0 -- 2018-06-03
 
 ### Breaking Changes

dhall-to-cabal.cabal

@@ -128,10 +128,10 @@ library
                  -fno-warn-name-shadowing
     build-depends:
         Cabal ^>=2.2,
-        base ^>=4.10 || ^>=4.11,
+        base ^>=4.10 || ^>=4.11 || ^>=4.12,
         bytestring ^>=0.10,
-        containers ^>=0.5,
-        contravariant ^>=1.4,
+        containers ^>=0.5 || ^>=0.6,
+        contravariant ^>=1.4 || ^>=1.5,
         dhall ^>=1.15.0,
         hashable ^>=1.2.6.1,
         insert-ordered-containers ^>=0.2.1.0,
@@ -155,7 +155,7 @@ executable dhall-to-cabal
                  -fno-warn-name-shadowing
     build-depends:
         Cabal ^>=2.2,
-        base ^>=4.10 || ^>=4.11,
+        base ^>=4.10 || ^>=4.11 || ^>=4.12,
         dhall ^>=1.15.0,
         dhall-to-cabal -any,
         insert-ordered-containers ^>=0.2.1.0,
@@ -179,7 +179,7 @@ executable cabal-to-dhall
                  -Wno-missing-local-signatures -Wno-monomorphism-restriction
                  -fno-warn-name-shadowing
     build-depends:
-        base ^>=4.10 || ^>=4.11,
+        base ^>=4.10 || ^>=4.11 || ^>=4.12,
         dhall ^>=1.15.0,
         bytestring ^>=0.10,
         dhall-to-cabal -any,
@@ -198,7 +198,7 @@ test-suite golden-tests
                  -Wno-missing-local-signatures -Wno-monomorphism-restriction
                  -fno-warn-name-shadowing
     build-depends:
-        base ^>=4.10 || ^>=4.11,
+        base ^>=4.10 || ^>=4.11 || ^>=4.12,
         Cabal ^>=2.2,
         Diff ^>=0.3.4,
         bytestring ^>=0.10,

dhall-to-cabal.dhall

@@ -21,11 +21,11 @@ in  let deps =
           , Diff =
               majorVersions "Diff" [ v "0.3.4" ]
           , base =
-              majorVersions "base" [ v "4.10", v "4.11" ]
+              majorVersions "base" [ v "4.10", v "4.11", v "4.12" ]
           , bytestring =
               majorVersions "bytestring" [ v "0.10" ]
           , containers =
-              majorVersions "containers" [ v "0.5" ]
+              majorVersions "containers" [ v "0.5", v "0.6" ]
           , dhall =
               majorVersions "dhall" [ v "1.15.0" ]
           , dhall-to-cabal =
@@ -39,7 +39,7 @@ in  let deps =
           , prettyprinter =
               majorVersions "prettyprinter" [ v "1.2.0.1" ]
           , contravariant =
-              majorVersions "contravariant" [ v "1.4" ]
+              majorVersions "contravariant" [ v "1.4", v "1.5" ]
           , hashable =
               majorVersions "hashable" [ v "1.2.6.1" ]
           , tasty =