Set DateFormatHandling.IsoDateFormat for serializer. Fixes #351

[olsh]

Related #351

According to the documentation, the default settings are used by JsonConvert method.

So, we have two options:

• Override the default settings (this is done in the PR)
• Create a new serializer with Create method

I believe that the second approach is preferable since we have more control over the serializing settings (I can update the PR).

@bruno-garcia Please let me know what do you think.

[bruno-garcia]

I believe the Create method might be a better option because it's possible users set other global settings to their app which break Sentry.

Thanks a lot for helping with this!

[codecov-io]

Codecov Report

Merging #353 into master will increase coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #353      +/-   ##
==========================================
+ Coverage   92.12%   92.13%   +<.01%     
==========================================
  Files          82       82              
  Lines        2109     2110       +1     
==========================================
+ Hits         1943     1944       +1     
  Misses        166      166

Impacted Files	Coverage Δ
src/Sentry/Internal/JsonSerializer.cs	91.66% <100%> (+0.75%)	⬆️

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[bruno-garcia]

I'll merge this meanwhile ;)