changed `version 3` to `version 3.x` per Joffrey

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Victoria Bialas 2017-02-16 14:37:03 -08:00 committed by GitHub
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@ -159,7 +159,7 @@ backup, include the `docker-compose.admin.yml` as well.
## Extending services
> Up to version 2.1 , version 3 does not support `extends` yet.
> Up to version 2.1 , version 3.x does not support `extends` yet.
Docker Compose's `extends` keyword enables sharing of common configurations
among different files, or even different projects entirely. Extending services