update release script

Author: timacdonald

RELEASE.md

@@ -3,7 +3,7 @@
 The following commands should be run when doing a release, where `{semver-type}` is `major`, `minor`, or `patch`.
 
 ```sh
-npm install --workspaces
+npm update --workspaces
 npm run build --workspaces
 bin/release {semver-type}
 git tag "{version}"