Increase coverage for tracers

[MakisChristou]

Description

Increased coverage of the following files: gen_structlog.go: 36.96% -> 71.7% logger.go: 26.06% -> 70.4% logger_json.go: 0.00% -> 78.9%

Fixes #21

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 57.27%. Comparing base (f77ab7f) to head (23f5914). Report is 8 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #670      +/-   ##
==========================================
+ Coverage   51.98%   57.27%   +5.29%     
==========================================
  Files         156      156              
  Lines       17218    17218              
==========================================
+ Hits         8950     9862     +912     
+ Misses       7445     6392    -1053     
- Partials      823      964     +141     

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.