build: ure recommended circle.yml

Author: eddyerburgh

.circleci/config.yml

@@ -1,16 +1,27 @@
 version: 2
 jobs:
-   build:
-     docker:
-       - image: circleci/node:4.8.2
-     steps:
+  build:
+    docker:
+      - image: circleci/node:7.10
+
+    working_directory: ~/repo
+
+    steps:
       - checkout
-      - run:
-          name: update-npm
-          command: 'sudo npm install -g npm@latest'
-      - run:
-          name: install-npm
-          command: npm install
-       - run:
-        name: test
-        command: npm test
+
+      # Download and cache dependencies
+      - restore_cache:
+          keys:
+          - v1-dependencies-{{ checksum "package.json" }}
+          # fallback to using the latest cache if no exact match is found
+          - v1-dependencies-
+
+      - run: yarn install
+
+      - save_cache:
+          paths:
+            - node_modules
+          key: v1-dependencies-{{ checksum "package.json" }}
+
+      # run tests!
+      - run: yarn test