Issue #3104116 by heddn, Mixologic: Supporting composer-based site installs

README.md

automatic_updates.services.yml

composer.json

composer.lock

scripts/update_dependencies.sh

src/ReadinessChecker/BlacklistPhp72Versions.php

src/ReadinessChecker/MinimumPhpVersion.php

src/ReadinessChecker/SupportedPhpVersion.php

src/Services/InPlaceUpdate.php

src/Services/ModifiedFiles.php

tests/src/Build/InPlaceUpdateTest.php

tests/src/Build/ModifiedFilesTest.php

...s/src/Kernel/ReadinessChecker/SupportedPhpVersionTest.php

vendor/autoload.php

vendor/composer/ClassLoader.php

vendor/composer/LICENSE

vendor/composer/autoload_classmap.php

vendor/composer/autoload_files.php

vendor/composer/autoload_namespaces.php

vendor/composer/autoload_psr4.php