build: bump version to 0.2.1 for release

Bump version for next release.

Signed-off-by: Anirudh Rayabharam <anrayabh@microsoft.com>

Author: anirudhrb

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "acpi_tables"
-version = "0.2.0"
+version = "0.2.1"
 authors = ["The Cloud Hypervisor Authors"]
 description = "Infrastructure for creating dynamic (via AML) and static ACPI tables"
 repository = "https://github.com/rust-vmm/acpi_tables"