Add ability to skip frames

[ribice]

I don't find this solution elegant in particular, but it adds ability to skipFrames in StackTrace (which resolves #741 for example).

Is EventFromMessage invoked directly by external users? If so, this would be a breaking change and instead a variadic options/parameter could be added.

I'll add tests once we agree on the implementation.

[codecov]

Codecov Report

Attention: Patch coverage is 86.36364% with 3 lines in your changes missing coverage. Please review.

Project coverage is 82.05%. Comparing base (dafeb07) to head (4701327).

Files	Patch %	Lines
stacktrace.go	85.71%	1 Missing and 1 partial ⚠️
client.go	87.50%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #852      +/-   ##
==========================================
- Coverage   82.09%   82.05%   -0.04%     
==========================================
  Files          51       51              
  Lines        4518     4520       +2     
==========================================
  Hits         3709     3709              
- Misses        661      662       +1     
- Partials      148      149       +1     

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[cleptric]

I fear this is something we would need to expose on the top level methods too :/
So CaptureMessage, CaptureException and most likely Recover too, to be truly useful.
An variadic options argument might be the better way forward.

[ribice]

I fear this is something we would need to expose on the top level methods too :/ So CaptureMessage, CaptureException and most likely Recover too, to be truly useful. An variadic options argument might be the better way forward.

I've added it to CaptureMessage, CaptureEvent, Recover/RecoverWithContext.