feat: add deprecation reporter

Author: JulianMar

composer.json

@@ -27,7 +27,8 @@
     "require-dev": {
         "phpunit/phpunit": "^9.0",
         "squizlabs/php_codesniffer": "^3.5",
-        "phpstan/phpstan": "^1.12"
+        "phpstan/phpstan": "^1.12",
+        "phpstan/phpstan-deprecation-rules": "^1.2"
     },
     "autoload-dev": {
         "psr-0": {

phpstan.neon

@@ -1,5 +1,6 @@
 includes:
 	- phpstan-baseline.neon
+	- vendor/phpstan/phpstan-deprecation-rules/rules.neon
 
 parameters:
 	level: 7