copier gh:meltano/edk my-new-extension

[ReneTC]

New developer here, not sure if it's me but I think
copier gh:meltano/edk my-new-extension
should be
copier copy gh:meltano/edk my-new-extension
in [README.md](https://github.com/meltano/edk/blob/main/README.md)

[edgarrmondragon]

@ReneTC Thanks for noticing that. Copier introduced that breaking change last year: https://github.com/copier-org/copier/blob/master/CHANGELOG.md#v800-2023-06-04

PRs to update the README are welcome!!