Changelog for recent coverity issues

diff --git a/changes/cov_485,486,487 b/changes/cov_485,486,487
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+  o Minor bugfixes:
+    - Fix memory leaks in the failing cases of the new SocksPort and
+      ControlPort code. Found by Coverity Scan. Bugfix on
+      0.2.3.3-alpha; fixes coverity CID 485, 486, and 487.
+