Enable '@PHP71Migration', '@PHP71Migration:risky' rulesets for PHP-CS-Fixer

Author: teohhanhui

.php_cs.dist

@@ -20,6 +20,8 @@ return PhpCsFixer\Config::create()
     ->setRiskyAllowed(true)
     ->setRules([
         '@DoctrineAnnotation' => true,
+        '@PHP71Migration' => true,
+        '@PHP71Migration:risky' => true,
         '@PHPUnit60Migration:risky' => true,
         '@Symfony' => true,
         '@Symfony:risky' => true,
@@ -33,7 +35,7 @@ return PhpCsFixer\Config::create()
         'braces' => [
             'allow_single_line_closure' => true,
         ],
-        'declare_strict_types' => true,
+        'compact_nullable_typehint' => true,
         'doctrine_annotation_array_assignment' => [
             'operator' => '=',
         ],
@@ -76,7 +78,7 @@ return PhpCsFixer\Config::create()
         'phpdoc_trim_consecutive_blank_line_separation' => true,
         'strict_comparison' => true,
         'strict_param' => true,
-        'ternary_to_null_coalescing' => true,
+        'void_return' => false, // BC breaks; to be done in API Platform 3.0
     ])
     ->setFinder($finder)
 ;