Bump version to 0.13.0, update `CHANGELOG.md`

[MaxDesiatov]

I'd be happy to wait a bit more to include DOMKit improvements, but #173 has been highly requested to be included in a release sooner rather than later. After all, this means that we have less pressure to rush DOMKit-related changes out in this release.

[github-actions[bot]]

Time Change: +149ms (1%)

Total Time: 8,180.75ms

ℹ️ View Unchanged

| Test name | Duration | Change | | :--- | :---: | :---: | | Serialization/Write JavaScript number directly | 169.25ms | -0.5ms | | Serialization/Write JavaScript string directly | 176.5ms | +3ms (1%) | | Serialization/Swift Int to JavaScript | 2,480.75ms | +32.25ms (1%) | | Serialization/Swift String to JavaScript | 2,588.5ms | +57ms (2%) | | Object heap/Increment and decrement RC | 2,765.75ms | +57.25ms (2%) |

_{performance-action}

[pedrovgs]

Yay!! My first release as contributor 👏 👏