docs: Prepare for v0.3.2 release

[mrnugget]

Preparing 0.3.2 with #217 so I can update it in sourcegraph/sourcegraph.

Test plan

• CI and ran cargo tests locally.

[olafurpg]

LGTM 👍🏻

Side-comment about the usage of a changelog.md, I'd love to just be able to push a git tag without a PR updating the changelog and bumping up the cargo.toml file.

[mrnugget]

go tests failing, taking a look.

[mrnugget]

Fixed and updated Development.md to add that task.

[mrnugget]

https://github.com/sourcegraph/scip/releases/tag/v0.3.2

[varungandhi-src]

I'd love to just be able to push a git tag without a PR updating the changelog and bumping up the cargo.toml file.

Having a hand-written change log seems more useful than having an automatically generated one from PR titles/commit messages... And the marginal effort to create a small PR doesn't seem that high.