close connection after reading the body

[ruseinov]

This closes the connection after reading from the body, otherwise too many open files error pops up when making a lot of requests.

http://craigwickesser.com/2015/01/golang-http-to-many-open-files/

You can also read the godoc that refers to Response.Close property for details:

	// Close records whether the header directed that the connection be
	// closed after reading Body. The value is advice for clients: neither
	// ReadResponse nor Response.Write ever closes a connection.
	Close bool