message: updated README for github enterprise env vars
diff: @@ -129,6 +129,9 @@ Restart your docker containers
  | `AUTH_GITHUB_CLIENT_ID` | `` | Github OAuth app Client ID. |
  | `AUTH_GITHUB_CLIENT_SECRET` | `` | Github OAuth app Client Secret. |
  | `AUTH_GITHUB_CALLBACK_URL` | `` | Github OAuth app authorization callback URL. |
  +| `AUTH_GITHUB_AUTHORIZATION_URL` | `` | Github (enterprise) OAuth app authorization url. |
  +| `AUTH_GITHUB_TOKEN_URL` | `` | Github (enterprise) OAuth app token url. |
  +| `AUTH_GITHUB_USER_PROFILE_URL` | `` | Github (enterprise) OAuth app user profile url. |
  | `AUTH_GOOGLE_ACTIVE` | `false` | Activate Google as an OAuth provider. |
  | `AUTH_GOOGLE_CLIENT_ID` | `` | Google OAuth app Client ID. |
  | `AUTH_GOOGLE_CLIENT_SECRET` | `` | Google OAuth app Client Secret. |
  