update circlefile to latest

.circleci/config.yml

@@ -0,0 +1,27 @@
+# Javascript Node CircleCI 2.0 configuration file
+#
+# Check https://circleci.com/docs/2.0/language-javascript/ for more details
+#
+version: 2
+jobs:
+  build:
+    docker:
+      - image: circleci/node:8.9
+
+    steps:
+      - checkout
+      - 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

.npmignore

@@ -1,5 +1,5 @@
 .DS_Store
-circle.yml
+.circleci
 node_modules
 test.js
 test.d.ts

circle.yml

@@ -1,3 +0,0 @@
-machine:
-  node:
-    version: 6.7.0