[#562] add ChangeLog entry

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+++ b/ChangeLog
@@ -1,3 +1,9 @@
+2020.  [doc]           andrei
+       Document the rate limiting feature of the new limits hook
+       library. It can apply a given limit of a certain number of
+       packets per time unit to a given client class or subnet.
+       (Gitlab #562, #1650)
+
 2019.  [func]          tmark
        Added new built-in class "SKIP_DDNS" which may be used in
        conjunction with the ddns-tuning hook library to to skip