Updated Gruntfile with new location of payload.js
Updated Gruntfile with new location of payload.js

gergelyke/snowplow-javascript-tracker,YieldifyLabs/snowplow-javascript-tracker,fivetran/snowplow-javascript-tracker,YieldifyLabs/snowplow-javascript-tracker,fivetran/snowplow-javascript-tracker,snowplow/snowplow-javascript-tracker,juliomenendez/snowplow-javascript-tracker,snowplow/snowplow-javascript-tracker,snowplow/snowplow-javascript-tracker,YieldifyLabs/snowplow-javascript-tracker,fivetran/snowplow-javascript-tracker,snowplow/snowplow-javascript-tracker,juliomenendez/snowplow-javascript-tracker,juliomenendez/snowplow-javascript-tracker