changes file for callgraph scripts

diff --git a/changes/callgraph b/changes/callgraph
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+  o Testing:
+    - Add a new set of callgraph analysis scripts that use clang to
+      produce a list of which Tor functions are reachable from which
+      other Tor functions. We're planning to use these to help simplify
+      our code structure by identifying illogical dependencies.