fix wrong version number

Author: willforde

HISTORY.md

@@ -4,7 +4,7 @@ All notable changes to this project will be documented in this file.
 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).
 
-## [0.9.7] - 2019-03-11
+## [0.9.8] - 2019-03-11
 ### Fixed
 - Dailymotion videos not working when using extract_source.