Update "TechEmpower Benchmark" from round 12 to round 18 (valyala#683)

* Update "TechEmpower Benchmark" from round 12 to round 16

* Update "TechEmpower Benchmark" to round 18

Fix FasthttpSocksDialer documentation

Removing redundant else statement from HeaderCookie (valyala#596)

Fix comment. (valyala#571)

Signed-off-by: Xiao YongBiao <xyb4638@gmail.com>

add tests for copyto (valyala#545)

* add tests for copyto
* add HeaderCopy Test reflect.DeepEqual

add method Sort in args (valyala#505)

* add method StringSort QueryStringSort AppendBytesSort in args

* simplify code

* only Sort method

* format

* add method StringSort QueryStringSort AppendBytesSort in args

* simplify code

* only Sort method

* format

* merge and fix tests

* change sort into generic by having the sort function

* change sort into generic by having the sort function

* change comment

Support Go modules

added missing byte 0xFF into hex2intTable. This fixes panic when deco…

…ding specially crafted string like "%\xff"

Set response Server header to Server.Name if it is empty. This proper…

…ly handles valyala#118

New release