Add default values for variables in the configuration file

[simonsilvalauinger]

implements #112

[pmwmedia]

Thank you very much for your pull request! Code looks clean and self explaining :-) I really appreciate that you have also supplied unit tests!

Just a minor change request: tinylog has to be compatible with Java 1.6 to support Android as well. Could refactor your code to avoid using an Optional, which was introduced with Java 1.8.

[codecov]

Codecov Report

Merging #115 into v2.0 will increase coverage by <.01%.
The diff coverage is 100%.

@@             Coverage Diff              @@
##               v2.0     #115      +/-   ##
============================================
+ Coverage     94.84%   94.85%   +<.01%     
- Complexity     2187     2190       +3     
============================================
  Files           103      103              
  Lines          4153     4161       +8     
  Branches        416      419       +3     
============================================
+ Hits           3939     3947       +8     
  Misses          108      108              
  Partials        106      106

Impacted Files	Coverage Δ	Complexity Δ
.../java/org/tinylog/configuration/Configuration.java	100% <100%> (ø)	30 <0> (+3)	⬆️

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[pmwmedia]

Thank you very much! I will open a branch for tinylog 2.1 soon and merge your pull request.

[github-actions]

This closed pull request has been locked automatically. However, please feel free to file an issue or create a new pull request.