Update README.md
Add a note explaining how to examine the environment variables (through `dokku run my-app env` rather than `dokku config my-app`)
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@@ -77,6 +77,10 @@ dokku redis:link lolipop playground
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# REDIS_PORT_6379_TCP_PORT=6379
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# REDIS_PORT_6379_TCP_ADDR=172.17.0.1
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# you can examine the environment variables
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# using our 'playground' app's env command
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dokku run playground env
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# you can customize the environment
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# variables through a custom docker link alias
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dokku redis:alias lolipop REDIS_DATABASE
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