Update minimum compiler versions
@@ -30,9 +30,9 @@ Requirements
------------
The libngtcp2 C library itself does not depend on any external
-libraries. The example client, and server are written in C++17, and
-should compile with the modern C++ compilers (e.g., clang >= 8.0, or
-gcc >= 8.0).
+libraries. The example client, and server are written in C++20, and
+should compile with the modern C++ compilers (e.g., clang >= 11.0, or
+gcc >= 11.0).
The following packages are required to configure the build system:
