Set log level to DEBUG for all transports

[leszekhanusz]

By popular request (#178, #400, #453), setting log level to DEBUG instead of INFO for all transports.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (7fb869a) to head (843381c).
Report is 15 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##            master      #552   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           38        40    +2     
  Lines         2908      3005   +97     
=========================================
+ Hits          2908      3005   +97     

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