Merge pull request #77 from segmentio/circle-ci-2.0

Migrate to Circle CI 2.0

Author: f2prateek

.circleci/config.yml

@@ -0,0 +1,34 @@
+version: 2
+jobs:
+  test:
+    docker:
+      - image: circleci/node:4-browsers
+    steps:
+      - checkout
+      - restore_cache:
+          key: dependency-cache-{{ checksum "package.json" }}
+      - run: npm config set "//registry.npmjs.org/:_authToken" $NPM_AUTH
+      - run: make test
+      - save_cache:
+          key: dependency-cache-{{ checksum "package.json" }}
+          paths:
+            - node_modules
+    publish:
+      docker:
+        - image: circleci/node:4-browsers
+      steps:
+        - attach_workspace: { at: . }
+        - run: npm publish .
+workflows:
+  version: 2
+  test_and_publish:
+    jobs:
+      - test
+      - publish:
+          requires:
+            - test
+          filters:
+            tags:
+              only: /[0-9]+(\.[0-9]+)*(-.+)?/
+            branches:
+              only: master