:art: Add flush to FileIO

diff --git a/plug b/plug
index 7121bd4bd7ba6429999b1c54f68d9c3edbfd416b..7fa0a948f67335204cab7b72e4837b99699c2d32 160000 (submodule)
--- a/plug
+++ b/plug
@@ -1 +1 @@
-Subproject commit 7121bd4bd7ba6429999b1c54f68d9c3edbfd416b
+Subproject commit 7fa0a948f67335204cab7b72e4837b99699c2d32