Prepare 7.0.9 release for Linux and OS X

Changelog and config.yml update

Bundle-Data/Docs/ChangeLog.txt

+Tor Browser 7.0.9 -- October 31 2017
+ * OS X
+   * Bug 24052: Streamline handling of file:// resources
+ * Linux
+   * Bug 24052: Streamline handling of file:// resources
+
 Tor Browser 7.0.8 -- October 25 2017
  * All Platforms
    * Update Torbutton to 1.9.7.9

tools/update-responses/config.yml

@@ -20,14 +20,14 @@ build_targets:
     osx64: Darwin_x86_64-gcc3
 channels:
     alpha: 7.0a4
-    release: 7.0.8
+    release: 7.0.9
 versions:
-    7.0.8:
+    7.0.9:
         platformVersion: 52.4.1
-        detailsURL: https://blog.torproject.org/tor-browser-708-released
+        detailsURL: https://blog.torproject.org/tor-browser-709-released
         incremental_from:
-          - 7.0.6
           - 7.0.7
+          - 7.0.8
         migrate_archs:
           osx32: osx64
         migrate_langs: