Bump phpstan/phpstan from 0.10.8 to 0.11

Bumps [phpstan/phpstan](https://github.com/phpstan/phpstan) from 0.10.8 to 0.11.
- [Release notes](https://github.com/phpstan/phpstan/releases)
- [Commits](phpstan/phpstan@0.10.8...0.11)

Signed-off-by: dependabot[bot] <support@dependabot.com>

Author: dependabot-support

composer.json

@@ -19,7 +19,7 @@
     "jakub-onderka/php-parallel-lint": "^1.0.0",
     "localheinz/composer-normalize": "^1.0.0",
     "nunomaduro/collision": "^2.1",
-    "phpstan/phpstan": "^0.10.7",
+    "phpstan/phpstan": "^0.10.7 || ^0.11",
     "phpunit/phpunit": "^7.5"
   },
   "require-dev": {},