README.md: Improve compilation instructions

README.md

@@ -96,9 +96,10 @@ See `rt/examples`.
 `typon/rt` is a headers-only library, so no preliminary build step is required.
 Programs only need to include `rt/include/typon/typon.hpp`.
 
-Compiling requires `gcc++-11` or `clang++-14` or more recent.
+Compiling requires a compiler supporting C++20, such as `gcc++-11` or
+`clang++-14` or more recent.
 
-See `rt/examples` for hints.
+See `rt/examples` for compilation flags.
 
 
 ### References