Update README.md and RELEASE.md to explain GITHUB_AUTH environment variable

[buschtoens]

I tried running this tool, but received this cryptic 404 error:

❯ yarn create rwjblue-release-it-setup
yarn create v1.22.4
[1/4] 🔍  Resolving packages...
warning create-rwjblue-release-it-setup > github-label-sync > octonode > request@2.88.2: request has been deprecated, see https://github.com/request/request/issues/3142
[2/4] 🚚  Fetching packages...
[3/4] 🔗  Linking dependencies...
[4/4] 🔨  Building fresh packages...
success Installed "create-rwjblue-release-it-setup@2.9.0" with binaries:
      - create-rwjblue-release-it-setup
[HttpError: Not Found] {
  message: 'Not Found',
  statusCode: 404,
  headers: {
    date: 'Tue, 16 Jun 2020 15:32:32 GMT',
    'content-type': 'application/json; charset=utf-8',
    'content-length': '107',
    connection: 'close',
    server: 'GitHub.com',
    status: '404 Not Found',
    'x-ratelimit-limit': '60',
    'x-ratelimit-remaining': '59',
    'x-ratelimit-reset': '1592325152',
    'x-github-media-type': 'github.v3; param=symmetra-preview; format=json',
    'access-control-expose-headers': 'ETag, Link, Location, Retry-After, X-GitHub-OTP, X-RateLimit-Limit, X-RateLimit-Remaining, X-RateLimit-Reset, X-OAuth-Scopes, X-Accepted-OAuth-Scopes, X-Poll-Interval, X-GitHub-Media-Type, Deprecation, Sunset',
    'access-control-allow-origin': '*',
    'strict-transport-security': 'max-age=31536000; includeSubdomains; preload',
    'x-frame-options': 'deny',
    'x-content-type-options': 'nosniff',
    'x-xss-protection': '1; mode=block',
    'referrer-policy': 'origin-when-cross-origin, strict-origin-when-cross-origin',
    'content-security-policy': "default-src 'none'",
    vary: 'Accept-Encoding, Accept, X-Requested-With',
    'x-github-request-id': 'E5B8:36872:50BA98:62C6D6:5EE8E610'
  },
  body: {
    message: 'Not Found',
    documentation_url: 'https://developer.github.com/v3/issues/labels/#update-a-label'
  },
  method: 'PATCH',
  endpoint: '/repos/ClarkSource/eslint-config/labels/good%20first%20issue'
}
(node:35691) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). To terminate the node process on unhandled promise rejection, use the CLI flag `--unhandled-rejections=strict` (see https://nodejs.org/api/cli.html#cli_unhandled_rejections_mode). (rejection id: 1)
(node:35691) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.
✨  Done in 15.25s.

I read through the source code and realized that it implicitly expects the GITHUB_AUTH env var to be set. After setting the variable, it worked! ✨

To save others from running into this as well, I updated the docs to explain this prerequisite setup.

[buschtoens]

Should we recommend a specific env setup here? Personally I use direnv, but I'm a bit worried that some nasty package in node_modules may sniff my env vars. I wonder, how have you configured it?

[hjdivad]

I wouldn't. Setting environment variables is a common enough task that it's a reasonable context to assume and I don't think this repo should be opinionated one way or another on how they're set.

[hjdivad]

Thanks @buschtoens! This looks great, it's always nice to get doc improvements.

The only change I'd like to see is not linking to the release-it docs since they use a different env name, although I don't think it's particularly important either way.

[hjdivad]

I wouldn't. Setting environment variables is a common enough task that it's a reasonable context to assume and I don't think this repo should be opinionated one way or another on how they're set.

[hjdivad]

Thanks @buschtoens!