Update vendor (#1265)

vendor/github.com/mattermost/logr/target/writer.go

@@ -0,0 +1,40 @@
+package target
+
+import (
+	"io"
+	"io/ioutil"
+
+	"github.com/mattermost/logr"
+)
+
+// Writer outputs log records to any `io.Writer`.
+type Writer struct {
+	logr.Basic
+	out io.Writer
+}
+
+// NewWriterTarget creates a target capable of outputting log records to an io.Writer.
+func NewWriterTarget(filter logr.Filter, formatter logr.Formatter, out io.Writer, maxQueue int) *Writer {
+	if out == nil {
+		out = ioutil.Discard
+	}
+	w := &Writer{out: out}
+	w.Basic.Start(w, w, filter, formatter, maxQueue)
+	return w
+}
+
+// Write converts the log record to bytes, via the Formatter,
+// and outputs to the io.Writer.
+func (w *Writer) Write(rec *logr.LogRec) error {
+	_, stacktrace := w.IsLevelEnabled(rec.Level())
+
+	buf := rec.Logger().Logr().BorrowBuffer()
+	defer rec.Logger().Logr().ReleaseBuffer(buf)
+
+	buf, err := w.Formatter().Format(rec, stacktrace, buf)
+	if err != nil {
+		return err
+	}
+	_, err = w.out.Write(buf.Bytes())
+	return err
+}