Change circle configuration to be compatible with 2.0

.circleci/config.yml

@@ -0,0 +1,28 @@
+version: 2
+
+jobs:
+  build:
+    working_directory: ~/babel-plugin-css-modules-transform
+    docker:
+      - image: circleci/node:10.12.0
+    steps:
+      - checkout
+      - restore_cache:
+          key: yarndeps-{{ .Branch }}-{{ checksum "yarn.lock" }}
+      - run:
+          name: Installing javascript dependencies
+          command: yarn install --cache-folder ~/.yarn-cache
+      - save_cache:
+          key: yarndeps-{{ .Branch }}-{{ checksum "yarn.lock" }}
+          paths:
+            - ~/.yarn-cache
+      - run:
+          name: Linting the source code
+          command: yarn lint
+      - run:
+          name: Testing the source code
+          command: |
+            yarn test
+            # test with babel 7
+            ./install-babel-7.sh
+            BABEL_7=1 yarn test