Merge pull request #160 from ergebnis/dependabot/composer/phpstan/phpstan-0.12.20

Build(deps-dev): Bump phpstan/phpstan from 0.12.19 to 0.12.20

Author: ergebnis-bot

composer.json

@@ -25,7 +25,7 @@
     "ergebnis/phpstan-rules": "~0.14.4",
     "ergebnis/test-util": "~1.0.0",
     "phpstan/extension-installer": "^1.0.4",
-    "phpstan/phpstan": "~0.12.19",
+    "phpstan/phpstan": "~0.12.20",
     "phpstan/phpstan-deprecation-rules": "~0.12.2",
     "phpstan/phpstan-phpunit": "~0.12.8",
     "phpstan/phpstan-strict-rules": "~0.12.2",