add an interface for more custom logging

[stetro]

Thanks for this library! Due to debugging issues we would like to use our custom logging when using this library. Usually App developers tend to use something like Timber. Therefore I proposed the following interface between LogUtils and android.util.Log to be able to replace the DefaultLogger with one which logs somewhere else (e.g. Timber), or even filters certain log levels.

[yayaa]

Nice one! Thanks for the PR.

Just the nullability part is important, I can approve and merge once you update that part.

Travis seems to have some connection problem (again 🙄) but the changes seem fine.

[stetro]

Cool, I also added a Readme comment for a short description.

[codecov-io]

Codecov Report

Merging #104 into master will increase coverage by 0.78%. The diff coverage is 42.85%.

@@            Coverage Diff             @@
##           master     #104      +/-   ##
==========================================
+ Coverage   66.47%   67.25%   +0.78%     
==========================================
  Files          30       31       +1     
  Lines        1053     1069      +16     
  Branches       91       91              
==========================================
+ Hits          700      719      +19     
+ Misses        293      292       -1     
+ Partials       60       58       -2     

Impacted Files	Coverage Δ
...om/yayandroid/locationmanager/LocationManager.java	76.00% <0.00%> (-2.09%)	:arrow_down:
.../locationmanager/helper/logging/DefaultLogger.java	9.09% <9.09%> (ø)
...om/yayandroid/locationmanager/helper/LogUtils.java	100.00% <100.00%> (+83.33%)	:arrow_up:

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[yayaa]

I've just released version 2.3.0 - assuming you needed this change :)

[stetro]

Great! Thanks a lot :)