fix inproper log of importing

[peter-wangxu]

fixes GH-202

[codecov]

Codecov Report

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Files	Patch %	Lines
persistqueue/__init__.py	83.33%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##             master     #203   +/-   ##
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  Coverage          ?   93.75%           
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  Files             ?       18           
  Lines             ?     2208           
  Branches          ?      230           
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  Hits              ?     2070           
  Misses            ?       88           
  Partials          ?       50           

Flag	Coverage Δ
python	93.75% <83.33%> (?)

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[epicwhale]

@peter-wangxu hey thanks for looking into this. I was wondering what the proposed fix accomplishes? For users who simply use say the SQLiteQueue and never install the extras, it will still always emit a redundant log each time "INFO:persistqueue:DBUtils may not be installed, install via 'pip install persist-queue[extra]'".

Would a more useful solution be to not import any MySQLQueues' in init.py unless the user explicitly loads that module?