Stack support (#535)

* rename previous lts-11 yaml file and add needed extra-deps

* use new lts-12.4

* add import of Data.Monoid.(<>) to make it compilable with base < 4.11 (and stack lts-11)

* add needed extra-deps

src/Dhall/Binary.hs

@@ -34,6 +34,7 @@ import Dhall.Core
     , URL(..)
     , Var(..)
     )
+import Data.Monoid ((<>))
 import Data.Text (Text)
 import Options.Applicative (Parser)
 import Prelude hiding (exponent)

stack-lts-11.yaml

@@ -0,0 +1,8 @@
+resolver: lts-11.12
+extra-deps:
+  - cborg-0.2.0.0
+  - serialise-0.2.0.0
+nix:
+  packages:
+    - ncurses
+    - zlib

stack-lts-6.yaml

@@ -21,3 +21,5 @@ extra-deps:
 - insert-ordered-containers-0.2.1.0
 - aeson-1.2.3.0
 - th-abstraction-0.2.6.0
+- cborg-0.2.0.0
+- serialise-0.2.0.0

stack.yaml

@@ -1,5 +1,6 @@
-resolver: lts-11.12
-
+resolver: lts-12.4
+extra-deps:
+  - serialise-0.2.0.0
 nix:
   packages:
     - ncurses