update newtonsoft

[endret]

Describe the purpose of your pull request

Update dependency of the SDK.

[codecov]

Codecov Report

Merging #23 (19aa469) into master (4fc4323) will increase coverage by 0.84%.
The diff coverage is n/a.

❗ Current head 19aa469 differs from pull request most recent head 54bb33c. Consider uploading reports for the commit 54bb33c to get more accurate results

@@            Coverage Diff             @@
##           master      #23      +/-   ##
==========================================
+ Coverage   96.04%   96.89%   +0.84%     
==========================================
  Files          27       27              
  Lines         708      708              
  Branches       71       71              
==========================================
+ Hits          680      686       +6     
  Misses         12       12              
+ Partials       16       10       -6     

Impacted Files	Coverage Δ
src/ConfigCatClient/ConfigCatClient.cs	92.48% <0.00%> (+0.75%)	⬆️
src/ConfigCatClient/HttpConfigFetcher.cs	96.55% <0.00%> (+1.14%)	⬆️
src/ConfigCatClient/Evaluate/RolloutEvaluator.cs	97.66% <0.00%> (+1.75%)	⬆️
...ConfigCatClient/ConfigService/ConfigServiceBase.cs	92.85% <0.00%> (+7.14%)	⬆️

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