Don't bother supporting a filename

lib/include/aocpp/Startup.hpp

@@ -8,15 +8,6 @@
 #include <memory>
 #include <optional>
 
-namespace aocpp {
-
-/// @brief Return the selected input stream or run the test suite
-/// @param argc Number of arguments
-/// @param argv Command line arguments
-auto Startup(int argc, char ** argv) -> std::unique_ptr<std::istream, void(*)(std::istream*)>;
-
-}
-
 auto Main(std::istream & in, std::ostream & out) -> void;
 
 #endif