Remove warning when starting Butler SOS

[mountaindude]

As of 9.10.0 this shows on startup:

(node:11836) ExperimentalWarning: The Fetch API is an experimental feature. This feature could change at any time
(Use `butler-sos --trace-warnings ...` to show where the warning was created)

Need to tell pkg to include either --no-warnings or set NODE_NO_WARNINGS=1 .

https://stackoverflow.com/questions/55778283/how-to-disable-warnings-when-node-is-launched-via-a-global-shell-script