Release blurb and dedication for 0.4.5.6

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 Changes in version 0.4.5.6 - 2021-02-15
-  BLURB
+  The Tor 0.4.5.x release series is dedicated to the memory of Karsten
+  Loesing (1979-2020), Tor developer, cypherpunk, husband, and father.
+  Karsten is best known for creating the Tor metrics portal and leading
+  the metrics team, but he was involved in Tor from the early days. For
+  example, while he was still a student he invented and implemented the
+  v2 onion service directory design, and he also served as an ambassador
+  to the many German researchers working in the anonymity field. We
+  loved him and respected him for his patience, his consistency, and his
+  welcoming approach to growing our community.
+
+  This release series introduces significant improvements in relay IPv6
+  address discovery, a new "MetricsPort" mechanism for relay operators
+  to measure performance, LTTng support, build system improvements to
+  help when using Tor as a static library, and significant bugfixes
+  related to Windows relay performance. It also includes numerous
+  smaller features and bugfixes.
 
   Below are the changes since 0.4.4.4-rc. For a complete list of changes
   since 0.4.4.7, see the ReleaseNotes file.