Allow to set timeout for read_html_live

[LukasWallrich]

Thanks for keeping on building the package - read_html_live is a great addition! However - and maybe I am missing something in the documentation - is there a way to increase the timeout for read_html_live? I have found no way to configure the chromote session, and the default fails too fast when routing requests through proxies.

[LukasWallrich]

Just figured out that it can be done for chromote (though not very conveniently either) - rstudio/chromote#155 - but it might be helpful to link to chromote settings from the read_html_live docs?

[hadley]

I think we can add an explicit argument. Is this specifically about opening the page for the first time?

[LukasWallrich]

Yes - ScrapeOps for example recommends a 120 sec timeout to give them time to find a proxy that is accepted by the webpage.