added optional numerals.db file arg to help text

src/main.cpp

@@ -25,7 +25,8 @@ void print_help() {
     std::cout << "[-i <number>] ";
     std::cout << "[-l <nl|en>] ";
     std::cout << "[-s <text>] ";
-    std::cout << "[-v]\n";
+    std::cout << "[-v] ";
+    std::cout << "[path-to-numerals.db]\n";
     std::cout << "  -a, --autogram <relaxed|strict|pangram>  autogram type, default relaxed\n";
     std::cout << "  -h, --help                               show this help text and exit\n";
     std::cout << "  -i, --max-iter <number>                  maximum iterations before restart, default 10\n";