Upgrade to .Net Standard 2.1 and .Net Core 3.1

https://www.nuget.org/packages/Profiler/0.2.0

Added tooling for reports implementations

• added public equality comparer for chains

https://www.nuget.org/packages/Profiler/0.1.3

Configuration changes and bug fixes

• add NuGet support
• fix bug (args weren't combined in child sections)
• rename 'ICustomFactorySettings' to 'IProfilerConfiguration'
• add chained configuration without dependency injection
• remove dependency-injection project

https://www.nuget.org/packages/Profiler/0.1.2

Improve performance, thread-safety and async operations.

Reimplement using section pool instead of thread-locals.

https://www.nuget.org/packages/Profiler/0.1.1

Minimal profiling tool designed for simplicity.

Measures time using reusable sections.
Tracing and reporting should be implemented in particular libraries.

https://www.nuget.org/packages/Profiler/0.1.0