Update gomatrix, add logging and other things

logging.go

@@ -0,0 +1,41 @@
+// maubot - A plugin-based Matrix bot system written in Go.
+// Copyright (C) 2018 Tulir Asokan
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+package maubot
+
+type Logger interface {
+	Write(p []byte) (n int, err error)
+	Debug(parts ...interface{})
+	Debugln(parts ...interface{})
+	Debugf(message string, args ...interface{})
+	Debugfln(message string, args ...interface{})
+	Info(parts ...interface{})
+	Infoln(parts ...interface{})
+	Infof(message string, args ...interface{})
+	Infofln(message string, args ...interface{})
+	Warn(parts ...interface{})
+	Warnln(parts ...interface{})
+	Warnf(message string, args ...interface{})
+	Warnfln(message string, args ...interface{})
+	Error(parts ...interface{})
+	Errorln(parts ...interface{})
+	Errorf(message string, args ...interface{})
+	Errorfln(message string, args ...interface{})
+	Fatal(parts ...interface{})
+	Fatalln(parts ...interface{})
+	Fatalf(message string, args ...interface{})
+	Fatalfln(message string, args ...interface{})
+}