Add fogotten security update in 2.7 changelog.

debian/changelog

@@ -11,11 +11,18 @@ tails (2.7) UNRELEASED; urgency=medium
     - Upgrade openssl to 1.0.1t-1+deb8u5.
     - Upgrade libarchive to 3.1.2-11+deb8u3.
     - Upgrade bind9 to 1:9.9.5.dfsg-9+deb8u8.
+    - Upgrade libav to 6:11.8-1~deb8u1.
+    - Upgrade ghostscript to 9.06~dfsg-2+deb8u3.
     - Upgrade c-ares to 1.10.0-2+deb8u1.
     - Upgrade nspr to 2:4.12-1+debu8u1.
     - Upgrade nss to 2:3.26-1+debu8u1.
     - Upgrade tar to 1.27.1-2+deb8u1.
+    - Upgrade curl to 7.38.0-4+deb8u5.
+    - Upgrade libgd3 to 2.1.0-5+deb8u7.
+    - Upgrade opendjk-7 to 7u111-2.6.7-2~deb8u1.
     - Upgrade mat to 0.5.2-3+deb8u1.
+    - Upgrade libxslt to 1.1.28-2+deb8u2.
+    - Upgrade pillow to 2.6.1-2+deb8u3.
 
   * Minor improvements
     - Ship Let's encrypt intermediate certificate to prepare the