Update for acorn v2.6.x compatability
Update the plugin code to remove 'async' and 'await' from the super-strict keyword tests introduced in acorn v2.6.x that generate parse errors before the plugin gets a chance to manage them.
Update the plugin code to remove 'async' and 'await' from the super-strict keyword tests introduced in acorn v2.6.x that generate parse errors before the plugin gets a chance to manage them.