Migrate to CircleCI 2.0 (#18)

.circleci/config.yml

@@ -0,0 +1,20 @@
+version: 2
+jobs:
+  build:
+    docker:
+      - image: fpco/stack-build:lts-11.11
+    steps:
+      - checkout
+      - restore_cache:
+          keys:
+            - stack
+      - run:
+          name: Build dependencies
+          command: stack build --only-dependencies
+      - save_cache:
+          key: stack
+          paths:
+            - ~/.stack/
+      - run:
+          name: Build package
+          command: stack build

circle.yml

@@ -1,14 +0,0 @@
-dependencies:
-
-  cache_directories:
-    - ~/.stack/
-    - .stack-work/
-
-  override:
-    - stack setup
-    - stack build --only-dependencies
-
-test:
-
-  override:
-    - stack build