fixed dependencies

vendor/github.com/lestrrat-go/file-rotatelogs/event.go

@@ -0,0 +1,17 @@
+package rotatelogs
+
+func (h HandlerFunc) Handle(e Event) {
+	h(e)
+}
+
+func (e *FileRotatedEvent) Type() EventType {
+	return FileRotatedEventType
+}
+
+func (e *FileRotatedEvent) PreviousFile() string {
+	return e.prev
+}
+
+func (e *FileRotatedEvent) CurrentFile() string {
+	return e.current
+}