Implement flush with context

[ribice]

Resolves #746

[codecov]

Codecov Report

Attention: Patch coverage is 33.33333% with 20 lines in your changes missing coverage. Please review.

Project coverage is 83.39%. Comparing base (109fca1) to head (f73ddb5).

Files with missing lines	Patch %	Lines
hub.go	0.00%	7 Missing ⚠️
transport.go	62.50%	6 Missing ⚠️
sentry.go	0.00%	3 Missing ⚠️
client.go	0.00%	2 Missing ⚠️
logrus/logrusentry.go	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #935      +/-   ##
==========================================
- Coverage   83.64%   83.39%   -0.26%     
==========================================
  Files          49       49              
  Lines        5129     5154      +25     
==========================================
+ Hits         4290     4298       +8     
- Misses        682      700      +18     
+ Partials      157      156       -1     

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[ribice]

The only thing failing here is the coverage. Do I have to 'fix' it or we can merge as-is?

[cleptric]

Do we have docs for this?

[ribice]

Do we have docs for this?

No. Should I add it in sentry-docs?

[cleptric]

Yes