[issue21574] Port image types detections from PIL to the imghdr module

[Andriy Sokolovskiy]

Changes by Andriy Sokolovskiy <sokandpal at yandex.ru>:


Added file: http://bugs.python.org/file36786/issue21574.zip

_______________________________________
Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue21574>
_______________________________________