Merge pull request #211 from tcbrindle/pr/fix-clang-19

Bump version of libc++ C++20 chrono workaround

Author: tcbrindle

example/calendar.cpp

@@ -30,7 +30,7 @@ constexpr auto col_sep = "  ";
 constexpr auto row_sep = ' ';
 
 // Workaround: libc++18 does not support C++20 chrono::time_point::operator++
-#if defined _LIBCPP_VERSION and _LIBCPP_VERSION < 190000
+#if defined _LIBCPP_VERSION and _LIBCPP_VERSION < 200000
 namespace std::chrono {
     sys_days& operator++(sys_days& d) {
         return d += days{1};