feat: updated composer require-dev versions (#20)

Author: prisis

composer.json

@@ -25,10 +25,10 @@
         "pedrotroller/php-cs-custom-fixer": "^2.15.2"
     },
     "require-dev": {
-        "phpstan/phpstan": "^0.10.7",
-        "phpstan/phpstan-deprecation-rules": "^0.10.2",
-        "phpstan/phpstan-phpunit": "^0.10.0",
-        "phpstan/phpstan-strict-rules": "^0.10.1",
+        "phpstan/phpstan": "^0.11.2",
+        "phpstan/phpstan-deprecation-rules": "^0.11.0",
+        "phpstan/phpstan-phpunit": "^0.11.0",
+        "phpstan/phpstan-strict-rules": "^0.11.0",
         "phpunit/phpunit": "^7.4.0"
     },
     "config": {