unicode help

src/example.cpp

@@ -48,6 +48,7 @@ int main(int argc, char* argv[])
       ("help", "Print help")
       ("int", "An integer", cxxopts::value<int>())
       ("option_that_is_too_long_for_the_help", "A very long option")
+      ("unicode", u8"A help option with an accent: à")
     ;
 
     options.add_options("Group")