Corrige la version minimale de phpstan compatible.

composer.json

@@ -13,7 +13,7 @@
         "php": ">=7.1",
         "jangregor/phpstan-prophecy": ">=0.7",
         "phpstan/extension-installer": "^1.0",
-        "phpstan/phpstan": "~0.12.0",
+        "phpstan/phpstan": "~0.12.34",
         "phpstan/phpstan-beberlei-assert": "~0.12.0",
         "phpstan/phpstan-doctrine": "~0.12.6",
         "phpstan/phpstan-phpunit": "~0.12.3",