[sentry] Sentry.io - This event was reported with an old version of the javascript SDK

[SegmentDestinationsBot]

Migrated from #32 by @notmessenger

The version of Sentry.io loaded by analytics.js is an older one, because the message of

This event was reported with an old version of the javascript SDK.

is reported within Sentry.io screens which links to https://docs.sentry.io/clients/javascript/?_ga=2.186673704.18631651.1540901773-1641070921.1532617420 which says

Deprecated Client
This SDK has been superseded by a new unified one. The documentation here is preserved for customers using the old client. For new projects have a look at the new client documentation: Unified Browser Javascript SDK.

Sort of related to segmentio/analytics.js#543