Fold in stable changelog for 9.0.6

projects/tor-browser/Bundle-Data/Docs/ChangeLog.txt

@@ -11,6 +11,15 @@ Tor Browser 9.5a8 -- March 13 2020
    * Windows
      * Bug 33535: Patch openssl to use SOURCE_DATE_EPOCH for copyright year
 
+Tor Browser 9.0.6 -- March 11 2020
+ * All Platforms
+   * Update Firefox to 68.6.0esr
+   * Bump NoScript to 11.0.15
+     * Bug 33430: Disable downloadable fonts on Safest security level
+ * Build System
+   * Windows
+     * Bug 33535: Patch openssl to use SOURCE_DATE_EPOCH for copyright year
+
 Tor Browser 9.5a7 -- March 6 2020
  * All Platforms
    * Translations update