Use property type hints

Not a BC break since all of them are private.

Author: jtojnar

.php-cs-fixer.php

@@ -8,6 +8,7 @@
     '@Symfony:risky' => true,
     '@PHP74Migration' => true,
     '@PHP74Migration:risky' => true,
+    'phpdoc_to_property_type' => true,
     // 'phpdoc_to_param_type' => true,
     // 'phpdoc_to_return_type' => true,
     'phpdoc_types_order' => false,

src/GuzzleTranscoder.php

@@ -12,17 +12,13 @@
 use Psr\Http\Message\ResponseInterface;
 
 class GuzzleTranscoder {
-    /** @var ?TranscoderInterface */
-    private $transcoder;
+    private ?TranscoderInterface $transcoder;
 
-    /** @var string */
-    private $targetEncoding;
+    private string $targetEncoding;
 
-    /** @var bool */
-    private $replaceHeaders;
+    private bool $replaceHeaders;
 
-    /** @var bool */
-    private $replaceContent;
+    private bool $replaceContent;
 
     /**
      * Constructs a class for transcoding Responses.