cargo: bump version to 0.10.4

Signed-off-by: Peng Tao <bergwolf@hyper.sh>

Author: bergwolf

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "fuse-backend-rs"
-version = "0.10.3"
+version = "0.10.4"
 keywords = ["fuse", "virtio", "virtio-fs", "vhost-user-fs"]
 categories = ["filesystem", "os::linux-apis"]
 description = "A rust library for Fuse(filesystem in userspace) servers and virtio-fs devices"