Note extending individual services only works up to version 2.1

Adds a note that the `extends` field only works up to version 2.1 
at the header of the page.
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Daniel Compton 2019-01-31 13:24:42 +13:00 committed by GitHub
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@ -8,7 +8,7 @@ Compose supports two methods of sharing common configuration:
1. Extending an entire Compose file by
[using multiple Compose files](extends.md#multiple-compose-files)
2. Extending individual services with [the `extends` field](extends.md#extending-services)
2. Extending individual services with [the `extends` field](extends.md#extending-services) (for Compose file versions up to 2.1)
## Multiple Compose files