Remove Travis since we've switched to GitHub Actions CI

.travis.yml

@@ -1,53 +0,0 @@
-language: python
-python:
-  - "3.6"
-env:
-  global:
-    - PYPI_USERNAME=autopub
-    - secure: "h5V/+YL+CrqvfAesNkSb824Ngk5x+f0eFzj/LBbmnzjvArKAmc6R6WGyx8SDD7WF/PlaTf0M1fH3a7pjIS8Ee+TS1Rb0Lt1HPqUs1yntg1+Js2ZQp3p20wfsDc+bZ4/2g8xLsSMv1EJ4np7/GJ5fXqpSxjr/Xs5LYA7ZLwNNwDw="
-    - secure: "GiDFfmjH7uzYNnkjQMV/mIkbRdmgkGmtbFPeaj9taBNA5tPp3IBt3GOOS6UL/zm9xiwu9Xo6sxZWkGzY19Hsdv28YPH34N3abo0QSnz4IGiHs152Hi7Qi6Tb0QkT5D3OxuSIm8LmFL7+su89Q7vBFowrT6HL1Mn8CDDWSj3eqbo="
-    - TWINE_USERNAME=$PYPI_USERNAME
-    - TWINE_PASSWORD=$PYPI_PASSWORD
-  matrix:
-    - TOX_ENV=docs
-    - TOX_ENV=flake8
-    - TOX_ENV=py3.5
-    - TOX_ENV=py3.6
-matrix:
-  include:
-    - python: 3.7
-      sudo: true
-      dist: xenial
-      env:
-      - TOX_ENV=py3.7
-addons:
-  apt_packages:
-    - pandoc
-before_install:
-  - sudo apt-get update -qq
-  - sudo locale-gen fr_FR.UTF-8 tr_TR.UTF-8
-install:
-  - pip install tox==2.5.0
-script: tox -e $TOX_ENV
-before_deploy:
-  - 'if [ "$TRAVIS_PULL_REQUEST" != "false" ]; then travis_terminate 0; fi'
-  - pip install githubrelease
-  - pip install --pre autopub
-  - autopub check || travis_terminate 0
-  - pip install poetry
-  - pip install twine
-  - git checkout ${TRAVIS_BRANCH}
-  - git remote set-url origin https://$GITHUB_TOKEN@github.com/$TRAVIS_REPO_SLUG
-deploy:
-  provider: script
-  script: autopub deploy
-  skip_cleanup: true
-  on:
-    branch: master
-    python: "3.7"
-# The channel name "irc.freenode.org#pelican" is encrypted against getpelican/pelican to prevent IRC spam of forks
-notifications:
-  irc:
-    channels:
-      - secure: "JP57f61QovrhmLoAF6oPOzIK2aXGfSO06FHg7yiuKBOWMiaxQejZUGJX919muCLhWJXDugsviIqCMoAWwNV3o1WQbqIr+G5TR+N9MrtCs4Zi6vpGj09bR8giKUKx+PPKEoe1Ew56E4y2LxzGO4Lj9hZx8M2YVdwPNWrWZgp6WXE="
-    on_success: change