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]

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 👏 👏