sound: Prepare v0.2.0 release

[MatiasVara]

Summary of the PR

Update changelog and Cargo.toml to v0.2.0

Requirements

Before submitting your PR, please make sure you addressed the following requirements:

• [x] All commits in this PR have Signed-Off-By trailers (with git commit -s), and the commit message has max 60 characters for the summary and max 75 characters for each description line.
• [x] All added/changed functionality has a corresponding unit/integration test.
• [x] All added/changed public-facing functionality has entries in the "Upcoming Release" section of CHANGELOG.md (if no such section exists, please create one).
• [x] Any newly added unsafe code is properly documented.

[stefano-garzarella]

I think we should also commit Cargo.lock changes. After the build I have this diff:

diff --git a/Cargo.lock b/Cargo.lock
index 5bce7e3..6bab63f 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1481,7 +1481,7 @@ dependencies = [

 [[package]]
 name = "vhost-device-sound"
-version = "0.1.0"
+version = "0.1.1"
 dependencies = [
  "alsa",
  "clap",

[stefano-garzarella]

I'm thinking if we should include also #580 in this release.