Bumped grunt-browserify version to 3.28.1 (closes #427)
Bumped grunt-browserify version to 3.28.1 (closes #427)

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