Updating server dependancies. Also adding github.com/jaytaylor/html2text and gopkg.in/gomail.v2 (#5748)

vendor/github.com/miekg/dns/server_test.go

@@ -20,7 +20,7 @@ func HelloServer(w ResponseWriter, req *Msg) {
 	w.WriteMsg(m)
 }
 
-func HelloServerBadId(w ResponseWriter, req *Msg) {
+func HelloServerBadID(w ResponseWriter, req *Msg) {
 	m := new(Msg)
 	m.SetReply(req)
 	m.Id++
@@ -548,7 +548,7 @@ func TestHandlerCloseTCP(t *testing.T) {
 				return
 			}
 			time.Sleep(time.Second / 10)
-			tries += 1
+			tries++
 			goto exchange
 		}
 	}()