Added CHANGELOG for 2.3.0
Added CHANGELOG for 2.3.0

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