Update CHANGELOG

CHANGELOG.txt

@@ -8,7 +8,14 @@ CHANGELOG for EDGE-Classic 1.37 (since EDGE-Classic 1.36)
 
 New Features
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-
+- Added support for MPEG video playback
+  - Files must use MPEG1 video and MP2 audio for proper decoding
+  - DDFGAME: TITLE_MOVIE=\<wad/packfile name\> command added
+    - Movies will always play before any defined TITLE_GRAPHIC entry in the same definition
+  - DDFLEVL: PRE.MOVIE=\<wad/packfile name\> and POST.MOVIE=\<wad/packfile name\> commands added
+    - Text will always be printed first, followed by movie playback, followed by any defined graphics
+      for a DDFLEVEL PRE/POST entry
+  - RSCRIPT: PLAY_MOVIE \<wad/packfile name\> command added
 
 General Improvements/Changes
 --------------------