Warn against Microsoft <windows.h> min and max macro (#1084)

Warn users they have defined the min/max macros which is not 
compatible with other code from the standard library or FTXUI.

Co-authored-by: Sylko Olzscher <sylko.olzscher@solostec.ch>
Co-authored-by: ArthurSonzogni <sonzogniarthur@gmail.com>

src/ftxui/component/task.cpp

@@ -16,5 +16,4 @@ bool PendingTask::operator<(const PendingTask& other) const {
   }
   return time.value() > other.time.value();
 }
-} // namespace ftxui::task
-
+}  // namespace ftxui::task