Fixed broken stacktrace behaviour

[rofinn]

Closes #96

[codecov]

Codecov Report

Merging #99 into master will decrease coverage by 1.4%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master      #99      +/-   ##
==========================================
- Coverage   98.94%   97.53%   -1.41%     
==========================================
  Files          11       11              
  Lines         284      284              
==========================================
- Hits          281      277       -4     
- Misses          3        7       +4

Impacted Files	Coverage Δ
src/loggers.jl	100% <100%> (ø)	⬆️
src/stdlib.jl	12.5% <0%> (-50%)	⬇️

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[iamed2]

Good solution, I agree that handlers can be responsible for their own async