allow for custom placeholders in the template string

[olafbuitelaar]

This PR enables the support of custom placeholders in the prettyLogTemplate string. The placeholders can be defined, be setting the overwrite.addPlaceholders function. For example to define the placeholder {{custom}}, add following method;

overwrite: {
  addPlaceholders: (logObjMeta: IMeta, placeholderValues: Record<string, string>) => {
    placeholderValues["custom"] = "test";
  },
}

[terehov]

Thank you. Can you also add to the documentation (README.md) please, so that our users understand how to use it?

[olafbuitelaar]

i've added some info about the feature

[codecov-commenter]

Codecov Report

Merging #244 (076076d) into master (0e751a5) will increase coverage by 0.01%. The diff coverage is 100.00%.

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@@            Coverage Diff             @@
##           master     #244      +/-   ##
==========================================
+ Coverage   98.78%   98.79%   +0.01%     
==========================================
  Files           6        6              
  Lines         326      328       +2     
  Branches      158      159       +1     
==========================================
+ Hits          322      324       +2     
  Misses          4        4              

Files Changed	Coverage Δ
src/BaseLogger.ts	98.01% <100.00%> (+0.03%)	:arrow_up:

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