S'aligne sur la version 0.11 de phpstan.

composer.json

@@ -11,12 +11,12 @@
     ],
     "require": {
         "php": ">=7.1",
-        "jangregor/phpstan-prophecy": ">=0.3.1 < 0.7",
-        "phpstan/phpstan": ">=0.11.7",
-        "phpstan/phpstan-beberlei-assert": ">=0.11",
-        "phpstan/phpstan-doctrine": ">=0.11.1",
-        "phpstan/phpstan-phpunit": ">=0.11",
-        "phpstan/phpstan-symfony": ">=0.11.1"
+        "jangregor/phpstan-prophecy": "0.5.0",
+        "phpstan/phpstan": "~0.11.7",
+        "phpstan/phpstan-beberlei-assert": "~0.11.0",
+        "phpstan/phpstan-doctrine": "~0.11.1",
+        "phpstan/phpstan-phpunit": "~0.11.0",
+        "phpstan/phpstan-symfony": "~0.11.1"
     },
     "bin": [
         "bin/phpstan-watch"