Merge pull request #27 from cht8687/patch-2

(chore):upgrade circleci to v2

Author: cht8687

circle.yml

@@ -0,0 +1,18 @@
+version: 2.1
+
+orbs:
+  node: circleci/node@1.1.4
+
+jobs:
+  build:
+    executor:
+      name: node/default
+      tag: lts
+    steps:
+      - checkout
+      - node/install-yarn
+      - node/with-cache:
+          steps:
+            - run: yarn install --frozen-lockfile
+      - run: npm run lint
+      - run: npm run test