Add mapping for dng extension.
@ -139,6 +139,7 @@ class MimeDetect {
'txt' => 'text/plain',
// images:
"bmp" => "image/bmp",
'dng' => 'image/x-adobe-dng',
"gif" => "image/gif",
"ief" => "image/ief",
"jpeg" => "image/jpeg",