Travis NPM publishing

.travis.yml

os: linux
language: node_js
node_js:
  - "8"
install:
  - npm install
cache:
  directories:
  - node_modules
script:
  - npm test
  - npm run build
notifications:
  email:
    on_pull_requests: false
    on_success: change
    on_failure: change
deploy:
  edge: true
  provider: npm
  api_token: "$NPM_TOKEN"
  cleanup: false
  access: public
  on:
    tags: true
    branch: master

package.json

"publishConfig": {
    "access": "public"
},
"files": [
    "dist/*",
    "README.md",
    "LICENSE",
    "package.json"
],