- Changed `post-package-install` / `post-package-update` event to be fired *after* the lock file has been updated as opposed to before
- Added support for removing packages using a wildcard with the `remove` command, e.g. `composer remove foo/*`
- Added `chat` to the list of `support` channels you can list in composer.json
- Added signal handling on require command to restore the composer.json in case of abort
- Added `--ignore` to `outdated` command to pass one or more packages that you do not want to be listed
- Added `--no-dev` to `check-platform-reqs` command to skip dev requirements even if they are installed
- Added support for running plugin commands from sub-directories within a project much like other Composer commands
- Added support for running Composer via phpdbg
- Added `lib-imagick` platform package
- Fixed validate command always checking for disabled checks when used with `--strict`