The cf_GET() example failed.

Hi!
I've tried 
`
res <- cf_GET("https://www.bitmarket.pl/graphs/BTCPLN/90m.json")
`
and got
`
This doesn't _look_ like a cloudflare-protected site, but giving it a go anyway
`
and tried 
`
str(httr::content(res, as="parsed"))
`
and got
`
List of 2
`
`
 $ node:<externalptr>
`
`
 $ doc :<externalptr>
`

Please help.


