Add changes file for bug #22702.

See: https://bugs.torproject.org/22702

changes/bug22702

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+  o Major bugfixes (directory protocol):
+    - Ensure that we sent "304 Not modified" as HTTP status code when a
+      client is attempting to fetch a consensus or consensus diff that
+      matches the latest consensus we have available. Fixes bug 22702;
+      bugfix on 0.3.1.1-alpha.