use circle instead of travis

.travis.yml

-language: node_js
-node_js:
-  - node
-  - lts/*
-
-cache:
-  directories:
-    - "$HOME/.npm"
-
-script:
-  - npm run lint
-  - npm run test:ci
-  - npm run build
-
-after_success:
-  - bash <(curl -s https://codecov.io/bash)
-
-jobs:
-  include:
-    - stage: release
-      node_js: lts/*
-      script:
-        - npm run build
-        - npm run semantic-release
-    - stage: deploy
-      node_js: lts/*
-      script:
-        - npm run ghpages
-      deploy:
-        provider: pages
-        skip_cleanup: true
-        local_dir: dist
-        github_token: $GH_TOKEN
-        on:
-          branch: master
-
-notifications:
-  email: false

circle.yml

+version: 2.1
+jobs:
+  test:
+    docker:
+      - image: circleci/node:10-browsers
+        environment:
+          CHROME_BIN: '/usr/bin/google-chrome'
+    steps:
+      - checkout
+      - restore_cache:
+          key: dependency-cache-{{ checksum "package.json" }}
+      - run:
+          name: npm-install
+          command: npm install
+      - save_cache:
+          key: dependency-cache-{{ checksum "package.json" }}
+          paths:
+            - ./node_modules
+      - run:
+          name: test
+          command: npm run test:ci
+      - run:
+          name: lint
+          command: npm run lint
+      - run:
+          name: codecov
+          command: bash <(curl -s https://codecov.io/bash)
+  release:
+    docker:
+      - image: circleci/node:10
+    steps:
+      - checkout
+      - restore_cache:
+          key: dependency-cache-{{ checksum "package.json" }}
+      - run: npm install
+      - run: npm run build
+      - run: npm run semantic-release
+
+workflows:
+  version: 2
+  test_and_release:
+    # Run the test jobs first, then the release only when all the test jobs are successful
+    jobs:
+      - test
+      - release:
+          filters:
+            branches:
+              only:
+                - master
+          requires:
+            - test