2.18.0

Improvements

• Introduce IncludeErrorSet(IErrorSet), ExcludeErrorSet(IErrorSet) methods for PolicyCollection.
• Introduce IncludeErrorSet(IErrorSet) and ExcludeErrorSet(IErrorSet) extension methods for the PolicyDelegateCollection(<T>) classes.
• Introduce the TryCatchBase class and the ITryCatch<T> interface for dependency injection scenarios.

Small changes

• Introduce ITryCatch.HasCatchBlockForAll property.
• Dispose of CancellationTokenSource objects in tests where it was absent.

Docs changes

• Add code coverage badge.
• Update 'Error filters' README Chapter.
• Update 'TryCatch' README Chapter.