changes file for our NSS support

changes/NSS

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+  o Major features (portability, cryptography, experimental, TLS):
+    - Tor now has the option to compile with the NSS library instead of
+      OpenSSL. This feature is experimental, and we expect that bugs may
+      remain. It is mainly intended for environments where Tor's performance
+      is not CPU-bound, and where NSS is already known to be installed.
+      To try it out, configure Tor with the --enable-nss flag.
+      Closes ticket 26631.