Integrate phpstan-strict-rules

Author: ondrejmirtes

Diff for: composer.json

@@ -23,6 +23,7 @@
 		"phing/phing": "^2.13.0",
 		"phpstan/phpstan-php-parser": "^0.9",
 		"phpstan/phpstan-phpunit": "^0.9",
+		"phpstan/phpstan-strict-rules": "^0.9",
 		"phpunit/phpunit": "^6.2",
 		"satooshi/php-coveralls": "^1.0",
 		"slevomat/coding-standard": "^2.0"

Diff for: phpstan.neon

@@ -2,6 +2,7 @@ includes:
 	- vendor/phpstan/phpstan-php-parser/extension.neon
 	- vendor/phpstan/phpstan-phpunit/extension.neon
 	- vendor/phpstan/phpstan-phpunit/rules.neon
+	- vendor/phpstan/phpstan-strict-rules/rules.neon
 
 parameters:
 	excludes_analyse: