tests(Travis CI): Disable Travid CI testing (#3185155)

.travis.yml

-language: php
-sudo: false
-
-# Cache composer vendor directories to speed up the composer install step.
-cache:
-  directories:
-    - $HOME/.composer/cache
-    - vendor
-
-jobs:
-  fast_finish: true
-  include:
-    # Support PHP 7.0 because that is the minimum requirement of Drupal 8 core.
-    - php: 7.0
-      dist: xenial
-    - php: 7.1
-      dist: bionic
-    - php: 7.2
-      dist: bionic
-    - php: 7.3
-      dist: bionic
-    - php: 7.4
-      dist: focal
-      env: PHPSTAN=1
-
-before_install:
-  # Speed up build time by disabling Xdebug when its not needed.
-  - phpenv config-rm xdebug.ini || echo 'No xdebug config.'
-
-before_script:
-  # We have a dedicated composer.json file for PHP 7.0 that does not have
-  # PHPStan because it requires >= PHP 7.1.
-  - if [[ ${TRAVIS_PHP_VERSION:0:3} == "7.0" ]]; then cp composer-php-7-0.json composer.json; fi
-  # Running composer install without a lock file will also update cached
-  # dependencies in vendor.
-  - composer install
-
-script:
-  - ./vendor/bin/phpunit
-  # Check that the sniffs themselves follow the PHPCS coding standard.
-  - ./vendor/bin/phpcs -p
-  # Ensure that a custom standard can be invoked and the auto-loading of
-  # abstract classes works.
-  - ./vendor/bin/phpcs -p --standard=tests/Drupal/phpcs-ruleset.xml tests/Drupal/good/ --ignore=tests/Drupal/good/GoodUnitTest.php
-  # Ensure that the DrupalPractice standard can be invoked standalone and the
-  # auto-loading of abstract classes works.
-  - ./vendor/bin/phpcs -p --standard=coder_sniffer/DrupalPractice tests/DrupalPractice/good/ --ignore=tests/DrupalPractice/good/GoodUnitTest.php
-   # Only run PHPStan on the latest PHP version, no need to run it multiple
-   # times.
-  - if [[ $PHPSTAN == "1" ]]; then ./vendor/bin/phpstan analyse; fi

README.md

 # Coder
 
-[![Build Status](https://travis-ci.org/pfrenssen/coder.svg?branch=8.x-3.x)](https://travis-ci.org/pfrenssen/coder)
+[![Automated tests](https://github.com/pfrenssen/coder/workflows/Tests/badge.svg)](https://github.com/pfrenssen/coder/actions)
 
 Coder is a library for automated Drupal code reviews and coding standard fixes. It
 defines rules for [PHP_CodeSniffer](https://github.com/squizlabs/PHP_CodeSniffer)