release: prepare for v0.13.1 release

Signed-off-by: imeoer <[email protected]>

Author: imeoer

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "fuse-backend-rs"
-version = "0.13.0"
+version = "0.13.1"
 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"