Add changes file for feature2553

changes/feature2553

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+  o Major features:
+    - Add a 'tor2web mode' for clients which want to connect to hidden
+      services non-anonymously (and possibly more quickly).  As a
+      safety measure to try to keep users from turning this on without
+      knowing what they are doing, tor2web mode must be explicitly
+      enabled at compile time, and a copy of Tor compiled to run in
+      tor2web mode cannot be used as a normal Tor client.  Implements
+      feature 2553.
+