Raise minimum Magento version to 2.3

Since laminas/laminas-code was introduced for the code
generation and since laminas/laminas-code cannot be
installed side-by-side with zendframework/zend-code, the
minimum Magento version has to be raised to 2.3.

Author: shochdoerfer

README.md

@@ -8,8 +8,18 @@ work for Magento 2 projects.
 
 ## Requirements
 
-This PHPStan extension requires PHPStan 1.1. If you are using a Magento version that requires an older version of PHPStan,
-you need to manually upgrade before installing this extension.
+PHP: PHP 7.2 or higher
+
+Magento: Magento 2.3 or higher
+
+PHPStan: PHPStan 1.1
+
+If you are using a Magento version that requires an older version of PHPStan,  you need to manually upgrade it before 
+installing this extension. Change the PHPStan version to 1.1 in your composer.json and run:
+
+```
+composer update phpstan/phpstan --with-all-dependencies
+```
 
 ## Installation
 

composer.json

@@ -22,7 +22,7 @@
     "phpstan/phpstan": "^1.1.0"
   },
   "conflict": {
-    "magento/framework": "<101.0.0"
+    "magento/framework": "<102.0.0"
   },
   "require-dev": {
     "captainhook/captainhook": "^5.10.4",