Update the PHP CS Fixer configuration (#154)

Author: mspirkov

.php-cs-fixer.dist.php

@@ -12,12 +12,16 @@
 ]);
 
 return (new Config())
+    ->setRiskyAllowed(true)
     ->setParallelConfig(ParallelConfigFactory::detect())
     ->setRules([
         '@PER-CS3.0' => true,
         'no_unused_imports' => true,
         'ordered_class_elements' => true,
         'class_attributes_separation' => ['elements' => ['method' => 'one']],
+        'declare_strict_types' => true,
+        'native_function_invocation' => true,
+        'native_constant_invocation' => true,
         'fully_qualified_strict_types' => [
             'import_symbols' => true
         ],