Update RELEASE.md

Author: gavinr

RELEASE.md

@@ -5,7 +5,7 @@
 - Commit with message `:package: X.X.X` (replacing with version)
 - Push commit to master
 - Run `npm whoami`, making sure you're logged in properly to NPM. If not, `npm login`.
-- If you have GitHub 2FA enabled (you should!), you may need to set an environmental variable with a GitHub [personal access token](https://github.com/settings/tokens) (with "repo access" scope).
+- If you have GitHub 2FA enabled (you should!), you may need to set an environmental variable with a GitHub [personal access token](https://github.com/settings/tokens) (with "repo access" scope) (`export GH_RELEASE_GITHUB_API_TOKEN="..."`)
 - Run `npm run release` (or on Windows, run `scripts/release.sh` from a bash-compatible terminal like Git Bash, Windows Subsystem for Linux, etc)