Add a bullet point about traces from exceptions

README.md

@@ -173,6 +173,8 @@ Cpptrace provides functionality beyond what the standard library provides and wh
 - Resolving function parameter types
 - Providing traced exception objects
 - Providing an API for signal-safe stacktrace generation
+- Providing a way to retrieve stack traces from arbitrary exceptions, not just special cpptrace traced exception
+  objects. This is a feature coming to C++26, but cpptrace provides a solution for C++11.
 
 ## What does cpptrace have over other C++ stacktrace libraries?