chore: Prepare 0.13.1 release

Release v0.13.1 to consume kernel commandline parameter validation fix
and image header for ARM and RISC-V visibility change.

Signed-off-by: Ruoqing He <heruoqing@iscas.ac.cn>

Author: RuoqingHe

CHANGELOG.md

@@ -1,5 +1,7 @@
 # Upcoming Release
 
+# [v0.13.1]
+
 ## Changed
 - [[#148](https://github.com/rust-vmm/linux-loader/pull/148)] Fixing kernel commandline parameter validation
   This change allows parameter values containing spaces in the middle, provided they are enclosed in quotes. However, 

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "linux-loader"
-version = "0.13.0"
+version = "0.13.1"
 authors = [
     "The rust-vmm maintainers",
     "rust-vmm AWS maintainers <rust-vmm-maintainers@amazon.com>",