Remove travis

.travis.yml

@@ -1,67 +0,0 @@
-language: php
-
-dist: trusty
-sudo: false
-
-stages:
-  - Code Format and Static Analysis
-  - Units
-  - Test CommonMark (weak)
-
-cache:
-  directories:
-    - $HOME/.composer/cache
-
-jobs:
-  fast_finish: true
-  allow_failures:
-    - env: ALLOW_FAILURE
-
-  include:
-    - stage: Code Format and Static Analysis
-      php: 8.0
-      install: composer install --prefer-dist --no-interaction --no-progress
-      script:
-        - '[ -z "$TRAVIS_TAG" ] || [ "$TRAVIS_TAG" == "$(php -r "require(\"vendor/autoload.php\"); echo Erusev\Parsedown\Parsedown::version;")" ]'
-        - composer test-static -- --shepherd
-        - composer test-formatting
-        - composer test-dead-code
-
-
-    - &MUTATION_AND_UNIT_TEST
-      stage: Units
-      php: 7.1
-      install:
-        - composer update --prefer-dist --no-interaction --no-progress
-      script:
-        - composer test-units
-        - vendor/bin/infection --show-mutations --threads=4 --min-msi=90 --min-covered-msi=90
-
-    - <<: *MUTATION_AND_UNIT_TEST
-      php: 7.2
-    - <<: *MUTATION_AND_UNIT_TEST
-      php: 7.3
-    - <<: *MUTATION_AND_UNIT_TEST
-      php: 7.4
-    - <<: *MUTATION_AND_UNIT_TEST
-      php: 8.0
-
-    - <<: *MUTATION_AND_UNIT_TEST
-      php: nightly
-      env: ALLOW_FAILURE
-      script: composer test-units
-
-
-    - &COMMONMARK_TEST
-      stage: CommonMark
-      name: Weak
-      php: 7.4
-      env: ALLOW_FAILURE
-      install: composer install --prefer-dist --no-interaction --no-progress
-      script:
-        - composer test-commonmark-weak
-
-    - <<: *COMMONMARK_TEST
-      name: Strict
-      script:
-        - composer test-commonmark