fixed tests with nette/application 3.1

Author: petrparolek

composer.json

@@ -18,7 +18,7 @@
     "codeception/module-asserts": "^1.3.1",
     "codeception/module-phpbrowser": "^1.0.2",
     "latte/latte": "^2.7",
-    "nette/application": "^3.0",
+    "nette/application": "~3.1.0",
     "nette/di": "^3.0",
     "nette/tester": "^2.3.2",
     "ninjify/nunjuck": "^0.3",
@@ -29,6 +29,7 @@
     "phpstan/phpstan-strict-rules": "^0.12",
     "webchemistry/testing-helpers": "^3.0.0"
   },
+  "prefer-stable": true,
   "minimum-stability": "dev",
   "autoload": {
     "psr-4": {