fix: panic in case NewContext is used to initialize logger with Fatal

[rhnvrm]

Hey,

I missed adding ExitFn to NewContext() causing a panic.

Have added a patch to fix it along with a scoped exit function which checks if ExitFn is nil (since it is exposed) and calls os.Exit as a fallback.

Regards

[codecov-io]

Codecov Report

Merging #22 into master will decrease coverage by 0.46%.
The diff coverage is 77.77%.

@@            Coverage Diff             @@
##           master      #22      +/-   ##
==========================================
- Coverage     100%   99.53%   -0.47%     
==========================================
  Files           3        3              
  Lines         423      429       +6     
==========================================
+ Hits          423      427       +4     
- Misses          0        1       +1     
- Partials        0        1       +1

Impacted Files	Coverage Δ
entry.go	100% <100%> (ø)	⬆️
logger.go	99.38% <75%> (-0.62%)	⬇️

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[francoispqt]

Ok thanks for the quick reaction, let me review and maybe add a few tests.