[ChangeLog] Actualize

ChangeLog

+version <unreleased>
+
+Core
++ [extractor/common] Extract height and format id for HTML5 videos (#14034)
+* [downloader/http] Rework HTTP downloader (#506, #809, #2849, #4240, #6023,
+  #8625, #9483)
+    * Simplify code and split into separate routines to facilitate maintaining
+    * Make retry mechanism work on errors during actual download not only
+      during connection establishment phase
+    * Retry on ECONNRESET and ETIMEDOUT during reading data from network
+    * Retry on content too short
+    * Show error description on retry
+
+Extractors
+* [generic] Lower preference for extraction from LD-JSON
+* [rai] Fix audio formats extraction (#14024)
+* [youtube] Fix controversy videos extraction (#14027, #14029)
+* [mixcloud] Fix extraction (#14015, #14020)
+
+
 version 2017.08.23
 
 Core