Bump ngrok version used in CI to 2.x (closes #460)
Bump ngrok version used in CI to 2.x (closes #460)

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