Fix whitespaces in README configuration example

Author: sascha-egerer

README.md

@@ -7,7 +7,7 @@ Put this into your phpstan.neon config:
 
 ```
 includes:
-	- vendor/saschaegerer/phpstan-typo3/extension.neon
- parameters:
+    - vendor/saschaegerer/phpstan-typo3/extension.neon
+parameters:
     bootstrap: %rootDir%/../../saschaegerer/phpstan-typo3/src/PhpstanTypo3Bootstrap.php
 ```