Typo error in Demo/Lib/ldap/async/deltree.py (2.3.9)

[Zhang Huangbin]

Hi, developers.

There's an incorrect module name in Demo/Lib/ldap/async/deltree.py, it  
seems 'ldap.async.SearchHandler' should be replaced by  
'ldap.async.AsyncSearchHandler'.

python-ldap version: 2.3.9.

Thanks for your hard work :)

-- 
Best Regards.

Zhang Huangbin

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