Update README.md

Hi guys!

Updated README.md. Added example to `HTTP Authentication` section, how to make basic authentication using the URL itself as specified in RFC 1738: http://www.ietf.org/rfc/rfc1738.txt

Best regards, 
Pavlo Voznenko
Update README.md

Changed place for basic http authentication RFC 1738 example
Merge pull request #976 from fosco-maestro/patch-1

Update README.md