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Remove contradictory sentence in Environment Vars 

The sentence stated that no environment variables are required to use this image. However, the very first variable - POSTGRES_PASSWORD is stated as required. This is a direct contradiction. This change removes that contradiction and clarifies that the password is required.
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Aaron 2020-10-09 15:14:05 -04:00 committed by GitHub
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postgres/content.md
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@ -47,7 +47,7 @@ There are many ways to extend the `%%REPO%%` image. Without trying to support ev
## Environment Variables
The PostgreSQL image uses several environment variables which are easy to miss. While none of the variables are required, they may significantly aid you in using the image.
The PostgreSQL image uses several environment variables which are easy to miss. The only variable required is `POSTGRES_PASSWORD`, the rest are optional.
**Warning**: the Docker specific variables will only have an effect if you start the container with a data directory that is empty; any pre-existing database will be left untouched on container startup.