Make public members IReadOnly instead of Immutable

[bruno-garcia]

No description provided.

[codecov-io]

Codecov Report

Merging #37 into master will increase coverage by 1.35%.
The diff coverage is 92.63%.

@@            Coverage Diff             @@
##           master      #37      +/-   ##
==========================================
+ Coverage   94.62%   95.98%   +1.35%     
==========================================
  Files          69       70       +1     
  Lines        1692     1717      +25     
==========================================
+ Hits         1601     1648      +47     
+ Misses         91       69      -22

Impacted Files	Coverage Δ
src/Sentry/Protocol/Context/Device.cs	47.36% <ø> (ø)	⬆️
src/Sentry/Protocol/Context/OperatingSystem.cs	40% <ø> (ø)	⬆️
src/Sentry/Protocol/Context/App.cs	41.17% <ø> (ø)	⬆️
src/Sentry/Protocol/Context/Runtime.cs	36.36% <ø> (ø)	⬆️
src/Sentry/Protocol/Context/Browser.cs	28.57% <ø> (ø)	⬆️
src/Sentry/Protocol/Breadcrumb.cs	100% <ø> (ø)	⬆️
src/Sentry/Internal/MainExceptionProcessor.cs	100% <100%> (ø)	⬆️
...y/Infrastructure/ConcurrentDictionaryExtensions.cs	100% <100%> (ø)
src/Sentry.AspNetCore/AspNetCoreEventProcessor.cs	100% <100%> (ø)
src/Sentry/SentryClient.cs	100% <100%> (ø)	⬆️
... and 9 more

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