add option to set http handlers

transport/http/http.go

@@ -1,9 +1,11 @@
+// Package http returns a http2 transport using net/http
 package http
 
 import (
 	"github.com/micro/go-micro/transport"
 )
 
+// NewTransport returns a new http transport using net/http and supporting http2
 func NewTransport(opts ...transport.Option) transport.Transport {
 	return transport.NewTransport(opts...)
 }