Example release stage

.travis.yml

jobs:
  include:
    - python: '3.7'
    - python: '3.6'
    - python: '3.5'
    
    - stage: release
      if: tag IS present
      deploy:
        provider: pypi
        user: praekelt.org
        password:
          secure: <encrypted password>
        distributions: sdist bdist_wheel
        on:
          tags: true

      install: skip
      script: skip