Composer: don't mark as abandoned

... as the package name for the Composer package on Packagist will remain the same.

Author: jrfnl

composer.json

@@ -34,7 +34,6 @@
     "require-dev": {
         "phpunit/phpunit": "^4.0 || ^5.0 || ^6.0 || ^7.0"
     },
-    "abandoned": "phpcsstandards/php_codesniffer",
     "bin": [
         "bin/phpcs",
         "bin/phpcbf"