chore(ws): prepare v0.3.1 release

[JohnTitor]

PR Type

INSERT_PR_TYPE

PR Checklist

• Tests for the changes have been added / updated.
• Documentation comments have been added / updated.
• A changelog entry has been made for the appropriate packages.
• Format code with the nightly rustfmt (cargo +nightly fmt).

Overview

Fixes #634

[Copilot]

Pull request overview

This PR prepares the actix-ws crate for a v0.3.1 release by updating version numbers and changelog. The release addresses issue #634 by explicitly enabling actix-web's ws feature and ensuring proper TCP connection shutdown when sessions are dropped.

Changes:

• Updated version number from 0.3.0 to 0.3.1 in Cargo.toml
• Updated documentation badge links in README.md to reference version 0.3.1
• Added changelog entry for 0.3.1 release with two bug fixes

Reviewed changes

Copilot reviewed 3 out of 4 changed files in this pull request and generated no comments.

File	Description
actix-ws/Cargo.toml	Bumped package version to 0.3.1
actix-ws/README.md	Updated documentation and dependency badge URLs to reference 0.3.1
actix-ws/CHANGELOG.md	Added 0.3.1 release section with bug fix descriptions

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[JohnTitor]

@robjtede Hey Rob, seems I don't have a right to publish a new version of actix-ws. Could you invite me?

[robjtede]

@JohnTitor sure! added the core team to it now

[JohnTitor]

Thanks a lot!