changes file for ticket 28878

changes/ticket28878

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+  o Minor features (testing):
+    - The circuitpadding tests now use a reproducible RNG implementation,
+      so that if a test fails, we can learn why. Part of ticket 28878.
+    - Tor's tests now support an environment variable, TOR_TEST_RNG_SEED,
+      to set the RNG seed for tests that use a reproducible RNG.
+      Part of ticket 28878.
+
+  o Minor features (continuous integration):
+    - When running coverage builds on Travis, we now set TOR_TEST_RNG_SEED,
+      to avoid RNG-based coverage differences.
+      Part of ticket 28878.