chore: Prepare release 0.13.0

Signed-off-by: Patrick Roy <roypat@amazon.co.uk>

Author: roypat

CHANGELOG.md

@@ -2,6 +2,8 @@
 
 ## Unreleased
 
+## [v0.13.0]
+
 ### Added
 - [[#247]](https://github.com/rust-vmm/vm-memory/pull/247) Add `ReadVolatile` and
   `WriteVolatile` traits which are equivalents of `Read`/`Write` with volatile

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "vm-memory"
-version = "0.12.2"
+version = "0.13.0"
 description = "Safe abstractions for accessing the VM physical memory"
 keywords = ["memory"]
 categories = ["memory-management"]