2.8.1

• Update phpcbf binary to 2.8.1.
• No need to use tini, so it removed.
• Update year on LICENSE.
• Remove unused .dockerignore.

2.8.0

• Update phpcbf to 2.8.0.

2.7.1

Docker Image for PHP CodeSniffer's phpcbf v2.7.1.

• Use git tag for versioning image.
• Add mounted volume information to README.md.
• Use PHP 7.1.1 as base image.
• Use docker native --user instead of creating new user at runtime.