prevent closing an already closed channel in livelog

CHANGELOG.md

@@ -1,6 +1,10 @@
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [1.2.1] - 2019-07-27
+### Fixed
+- close and already closed channel in livelog causes panic
+
 ## [1.2.0] - 2019-07-27
 ### Added
 - semver environment variables

livelog/livelog.go

@@ -146,6 +146,7 @@ func (b *Writer) stop() bool {
 	if b.closed == false {
 		close(b.close)
 		closed = true
+		b.closed = true
 	}
 	b.Unlock()
 	return closed