Rename debug info key for more consistency

Author: olivervogel

src/EncodedImage.php

@@ -59,7 +59,7 @@ public function toDataUri(): string
     public function __debugInfo(): array
     {
         return [
-            'mimetype' => $this->mimetype(),
+            'mediaType' => $this->mediaType(),
             'size' => $this->size(),
         ];
     }

tests/Unit/EncodedImageTest.php

@@ -61,7 +61,7 @@ public function testMimetype(): void
     public function testDebugInfo(): void
     {
         $info = (new EncodedImage('foo', 'image/png'))->__debugInfo();
-        $this->assertEquals('image/png', $info['mimetype']);
+        $this->assertEquals('image/png', $info['mediaType']);
         $this->assertEquals(3, $info['size']);
     }
 }