Update changelog for 3-1

Change-Id: Id7aeef3e8b6e6f36a7a38770dc8cd93302bb9d4c
(cherry picked from commit 54b64229655d7cd25df948b88ef456790d02d75c)
diff --git a/debian/changelog b/debian/changelog
index e664f1c..170c6d7 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -1,3 +1,10 @@
+imx-board-tools (3-1) mendel-beaker; urgency=medium
+
+  * Prevent overwriting of files when saving image
+  * Enable running in headless mode
+
+ -- AIY Projects <support-aiyprojects@google.com>  Tue, 26 Feb 2019 11:29:08 -0800
+
 imx-board-tools (2-1) mendel-beaker; urgency=medium
 
   * Fix misnamed install file after package rename.