Update touchnode to use object due to deprecation in Gatsby v2

[gil--]

See https://next.gatsbyjs.org/docs/actions/#touchNode

Note: The plugin still works, it just spits out a bunch of deprecation warnings.

Calling "touchNode" with a nodeId is deprecated. Please pass an object containing a nodeId instead: touchNode({ nodeId: 'a-node-id' })
"touchNode" was called by gatsby-source-shopify
Calling "touchNode" with a nodeId is deprecated. Please pass an object containing a nodeId instead: touchNode({ nodeId: 'a-node-id' })

I'm guessing this would break v1 compatibility? Not sure if there's a more graceful way to support v1 or if plugins will simply stop supporting Gatsby v1

[camsloanftc]

@angeloashmore - would it be possible to get eyes on this?

[angeloashmore]

@camsloanftc Leaving for work now, but I'll take a look at this tonight and tomorrow morning 👍