[keen-io] keen.js version is out of date

[SegmentDestinationsBot]

Migrated from #1 by @ndhoule

From @d4rky-pl on April 14, 2015 12:37

Analytics.js uses prehistoric version of keen.js that was released almost a year ago. The latest version as of writing this is 3.2.4 whereas analytics still use 3.0.8 that doesn't support new visualisation apis amongst other things.

Copied from original issue: #592

[d4rky-pl]

I see this issue went full circle now (it was originally segmentio/analytics.js-integrations#592).