Errors were encountered while processing: postgresql-contrib-9.5

installation
2

A current app.yml should be using:

templates:
  - "templates/postgres.template.yml"
  - "templates/redis.template.yml"
  - "templates/web.template.yml"
  - "templates/web.ratelimited.template.yml"
## Uncomment these two lines if you wish to add Lets Encrypt (https)
  - "templates/web.ssl.template.yml"
  - "templates/web.letsencrypt.ssl.template.yml"

Why are you using PostgreSQL 9.3? Take a backup, fix templates, rebuild and, if needed, restore the backup.

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