Start a changelog for 0.4.5.3-rc

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+Changes in version 0.4.5.3-rc - 2021-01-12
+  Tor 0.4.5.3-rc is the first release candidate in its series.  It fixes
+  several bugs, including one that broke onion services on certain older ARM
+  CPUs.
+
+  Though we anticipate that we'll be doing a bit more clean-up between now
+  and the stable release, we expect that our remaining changes will be fairly
+  simple.  There will be at lease one more release candidate before 0.4.5.x
+  is stable.
+
+  o Minor features (crypto):
+    - Fix undefined behavior on our Keccak library. The bug only appears on
+      platforms with 32-byte CPU cache lines (e.g. armv5tel) and would result
+      in wrong digests. Fixes bug 40210; bugfix on 0.2.8.1-alpha. Thanks to
+      Bernhard Übelacker, Arnd Bergmann and weasel for diagnosing this.
+
+  o Minor features (documentation):
+    - Mention the !badexit directive that can appear in an authority's
+      approved-routers file, and update the description of the !invalid
+      directive. Closes ticket 40188.
+
+  o Minor bugfixes (config, bridge):
+    - Really fix the case where torrc has a missing ClientTransportPlugin but
+      configured with a Bridge line and UseBridges. Previously, we failed to
+      also look at the managed proxy list and thus it would fail for the
+      "exec" case. Fixes bug 40106; bugfix on 0.4.5.1-alpha.
+
+  o Minor bugfixes (build):
+    - Fix the --enable-static-tor switch to properly set the -static compile
+      option onto the tor binary only. Fixes bug 40111; bugfix on
+      0.2.3.1-alpha.
+    - Path to static libevent has been fixed as well which affects the
+      --enable-static-libevent to behave correctly now. The .a file is in
+      .libs/ of libevent repository, not at the root.
+
+  o Minor bugfixes (logging, relay):
+    - Logs the address discovered by the directory authorities if none were
+      configured or detected before. Fixes bug 40201; bugfix on 0.4.5.1-alpha.
+    - When launching bandwidth testing circuit, don't log notice that we are
+      doing a reachability test. Furthermore, avoid to trigger a
+      "CHECKING_REACHABILITY" control event. Fixes bug 40205; bugfix on
+      0.4.5.1-alpha.
+
+  o Minor bugfixes (relay, statistics):
+    - The connection statistics were wrongly exported in the extrainfo document
+      due to a problem in the file loading function which would wrongly truncate
+      the file reporting the wrong information. It is now fixed. Fixes bug
+      40226; bugfix on 0.4.5.1-alpha.
+
+  o Minor bugfixes (SOCKS5):
+    - Handle partial socks5 messages correctly.  Previously, our code would
+      send an incorrect error message if it got a socks5 request that wasn't
+      complete. Fixes bug 40190; bugfix on 0.3.5.1-alpha.
+
+
 Changes in version 0.4.5.2-alpha - 2020-11-23
   Tor 0.4.5.2-alpha is the second alpha release in the 0.4.5.x series.
   It fixes several bugs present in earlier releases, including one that