Update instructions given the new ADDRESS requirement #118
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Updates the readme to show in the instructions how to setup and use the newly required ADDRESS environment variable. As discussed in #116 there might be some better ways to handle this overall, but in the meantime the instructions should be updated so that people aren’t confused.
For quick reference: For Heroku, people currently need to deploy and then go to the app settings and set ADDRESS to their Heroku app url. For Docker, it needs to be set using -e or by modifying the Dockerfile. For Node, set manually.
Closes #117