chore(circleci): remove es5 check
chore(circleci): remove es5 check

The PKI.js package used by the SDK has non-es5 code in their dist build, so we can no longer guarantee an es5 build.

adamweeks/react-ciscospark-1,adamweeks/react-ciscospark-1,ciscospark/react-ciscospark,adamweeks/react-ciscospark-1,ciscospark/react-ciscospark,ciscospark/react-ciscospark