Update readme.txt

Adding release notes for v1.6.1

Author: pkevan

readme.txt

@@ -3,7 +3,7 @@ Contributors: automattic, nbachiyski, batmoo, johnjamesjacoby
 Tags: liveblog
 Requires at least: 3.5
 Tested up to: 4.8.2
-Stable tag: 1.6
+Stable tag: 1.6.1
 License: GPLv2 or later
 License URI: http://www.gnu.org/licenses/gpl-2.0.html
 
@@ -47,6 +47,13 @@ If you'd like to check out the code and contribute, [join us on github](https://
 
 == Changelog ==
 
+
+= 1.6.1 =
+
+* Remove support for Flash + Silverlight which are no longer supported in WP 4.9, see https://core.trac.wordpress.org/ticket/41755#no0
+* Bugfix for WPCOM: Don't force an AJAX URL if we're using the REST API.
+* Bugfix WPCOM: Retain SA access for A12s
+
 = 1.6 =
 
 * REST API support