Merge pull request #666 from bravosierrasierra/bravosierrasierra-patch-2

Fix checkpoint_write_time value type

collector/pg_stat_bgwriter.go

@@ -122,7 +122,7 @@ func (PGStatBGWriterCollector) Update(ctx context.Context, db *sql.DB, ch chan<-
 
 	var cpt int
 	var cpr int
-	var cpwt int
+	var cpwt float64
 	var cpst int
 	var bcp int
 	var bc int