Add default Host request header to README.md file (#1316)
Add default Host request header to README.md file (#1316)

Mention the Host header in the default request headers table.

According to the standard [RFC 7230 Hypertext Transfer Protocol (HTTP/1.1): Message Syntax and Routing |https://httpwg.org/specs/rfc7230.html#header.host]
    "A client MUST send a Host header field in all HTTP/1.1 request messages."
bitinn/node-fetch