Missing #include in fs.cpp

src/dds/util/fs.cpp

@@ -2,6 +2,8 @@
 
 #include <spdlog/fmt/fmt.h>
 
+#include <sstream>
+
 using namespace dds;
 
 std::fstream dds::open(const fs::path& filepath, std::ios::openmode mode, std::error_code& ec) {