Release preparations for 1.9.8.1

CHANGELOG update, version bump

src/CHANGELOG

+1.9.8.1
+ * Bug 20375: Warn users after entering fullscreen mode
+ * Bug 22989: Fix dimensions of new windows on macOS
+ * Bug 23526: Add 2017 Donation banner text
+ * Bug 23483: Donation banner on about:tor for 2017 (testing mode)
+ * Translations Update
+
 1.9.8
  * Bug 22610: Avoid crashes when canceling external helper app related downloads
  * Bug 22472: Fix FTP downloads when external helper app dialog is shown

src/install.rdf

@@ -6,7 +6,7 @@
         <em:name>Torbutton</em:name>
         <em:creator>Mike Perry</em:creator>
         <em:id>torbutton@torproject.org</em:id>
-        <em:version>1.9.8</em:version>
+        <em:version>1.9.8.1</em:version>
         <em:multiprocessCompatible>true</em:multiprocessCompatible>
         <em:homepageURL>https://www.torproject.org/projects/torbrowser.html.en</em:homepageURL>
         <em:optionsURL>chrome://torbutton/content/preferences.xul</em:optionsURL>