[Release] Increase version to 0.13.0

[nev21]

No description provided.

[Copilot]

Pull request overview

This PR bumps the version from 0.12.6 to 0.13.0 in preparation for a minor release that introduces new encoding/decoding functionality and enhances the custom error creation API.

Changes:

• Version bumped from 0.12.6 to 0.13.0 across package files
• CHANGELOG.md updated with v0.13.0 release notes documenting new encoding functions (Base64, Base64 URL-safe, Hex, URI) and enhanced createCustomError() with superArgsFn parameter
• README.md example version specification updated to reference 0.13.0

Reviewed changes

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

File	Description
package.json	Updated version field to 0.13.0
lib/package.json	Updated version field to 0.13.0
README.md	Updated recommended version specification example
CHANGELOG.md	Added v0.13.0 release notes with feature descriptions

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.78%. Comparing base (46c899a) to head (1552a10).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #526   +/-   ##
=======================================
  Coverage   98.78%   98.78%           
=======================================
  Files         111      111           
  Lines        3384     3384           
  Branches      717      718    +1     
=======================================
  Hits         3343     3343           
  Misses         41       41           

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[nevware21-bot]

Approved by nevware21-bot