tweak changes file.

changes/trove-2017-004

@@ -1,5 +1,8 @@
-  o Major bugfixes (hidden service, relay):
-    - Fix an assertion failure when an hidden service handles a malformed
-      BEGIN cell. This bug resulted in the service crashing triggered by a
-      tor_assert(). Part of TROVE-2017-004. Fixes bug 22493; bugfix on
-      tor-0.3.0.1-alpha. Found by armadev.
+  o Major bugfixes (hidden service, relay, security):
+    - Fix an assertion failure when an hidden service handles a
+      malformed BEGIN cell. This bug resulted in the service crashing
+      triggered by a tor_assert(). Fixes bug 22493, tracked as
+      TROVE-2017-004 and as CVE-2017-0375; bugfix on tor-0.3.0.1-alpha.
+      Found by armadev.
+
+