chore: add release information for 2.6.0

[AndyTWF]

This change adds the README and other updates for 2.6.0.

Summary by CodeRabbit

• New Features

  • Updated presence functionality to emit a LEAVE event only if a member was previously present.
  • Introduced experimental attributes on the Message type for edits and deletes.

• Bug Fixes

  • Removed a build check allowing npm to reference specific branches in the ably-js repository.

• Version Updates

  • Incremented version number from 2.5.0 to 2.6.0 across relevant files.

[coderabbitai]

Caution

Review failed

The pull request is closed.

Walkthrough

The changes in this pull request include updates to the versioning of the package and related files. The CHANGELOG.md has been modified to reflect the new version 2.6.0 and document key changes, including the removal of a build check and modifications to presence functionality. The package.json file has been updated to the new version number, and the version constant in AblyReactHooks.ts has also been updated to align with this version increment.

Changes

File	Change Summary
CHANGELOG.md	Added version entry for 2.6.0, documenting the removal of a build check, presence functionality changes, and updates to Message type attributes.
package.json	Updated version from 2.5.0 to 2.6.0.
src/platform/react-hooks/src/AblyReactHooks.ts	Updated exported constant version from '2.5.0' to '2.6.0', affecting the agent parameter in channelOptionsWithAgent.

Possibly related PRs

• Release version 2.5.0 #1915: The changes in this PR involve updating the version in CHANGELOG.md, package.json, and src/platform/react-hooks/src/AblyReactHooks.ts to 2.5.0, which is directly related to the version update to 2.6.0 in the main PR.

Suggested reviewers

• VeskeR
• SimonWoolf
• ttypic

🐇 In the code, we hop with glee,
A new version, oh so free!
Changes made, updates bright,
In the logs, our joy takes flight!
With each line, we dance and play,
Celebrating code in a joyful way!
🌟

---

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Reviewing files that changed from the base of the PR and between 8a3552d and 97eb58f.

📒 Files selected for processing (1)

• CHANGELOG.md (1 hunks)

---

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[coderabbitai]

Actionable comments posted: 2

🧹 Outside diff range and nitpick comments (1)

CHANGELOG.md (1)

9-9: Document experimental features

The experimental attributes for Message type supporting edits and deletes should be clearly documented with:

1. A warning that these are experimental features subject to change
2. Examples of usage
3. Any limitations or known issues

📜 Review details

Configuration used: CodeRabbit UI
Review profile: CHILL

📥 Commits

Reviewing files that changed from the base of the PR and between 174953b and db140f9.

⛔ Files ignored due to path filters (1)

• package-lock.json is excluded by !**/package-lock.json

📒 Files selected for processing (3)

• CHANGELOG.md (1 hunks)
• package.json (1 hunks)
• src/platform/react-hooks/src/AblyReactHooks.ts (1 hunks)

✅ Files skipped from review due to trivial changes (2)

• src/platform/react-hooks/src/AblyReactHooks.ts
• package.json

[ttypic]

LGTM

[VeskeR]

LGTM. Update the date and can merge