Added CHANGELOG for 2.4.3
Added CHANGELOG for 2.4.3

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