bump version

Former-commit-id: 1ee5f127f6cfa2bb93e0a17b8baf07d496961db9

manifest.json

@@ -8,7 +8,7 @@
 		"64": "extension/ui/resources/icon_64.png",
 		"128": "extension/ui/resources/icon_128.png"
 	},
-	"version": "1.13.8",
+	"version": "1.13.9",
 	"description": "__MSG_extensionDescription__",
 	"content_scripts": [
 		{