Documentation and implementation do not align on default protocols used

[LostKobrakai]

req/lib/req.ex

Lines 297 to 298 in bfabe15

	* `:protocols` - the HTTP protocols to use, defaults to `[:http1, :http2]`, that is default to HTTP/1 but if negotiated, allow HTTP/2
	over HTTP/1 connection. To force HTTP/2, set `protocols: [:http2]`.

Documented to use both http1 and http2

req/lib/req/steps.ex

Lines 983 to 984 in bfabe15

	protocols:
	connect_options[:protocols] || List.wrap(connect_options[:protocol] || :http1)

Implementation default is just http1

[wojtekmach]

Good catch, implementation is wrong and we should be sending to Finch protocols: [:http1, :http2] by default.

[wojtekmach]

FYI I've temporarily switched back to protocols: [:http1] due to sneako/finch#265. The plan is to go back to http1+http2 once that's fixed.