Documentation make reference to comented code not included in the release

[juanux]

The documentation is outdated and ambiguos.
Some of the features are not there anymore and the code is commented.

For example Encoder[A].withSchema(schemaFor)

is this project still alive or supported?

[sksamuel]

The docs probably refer to the pre 5 release.
I no longer actively work on this project myself, but I merge PRs and do releases.

[stale]

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