Start preliminary 1.3.3 release notes

Assuming the 1.3.2 release did not actually include the AC3 fix.

release-notes/1.3.3.txt

@@ -0,0 +1,6 @@
+NEW:
+
+
+FIXES:
+ - Fix plaxback with optical device type and AC3 enabled
+ - Fix direct play with some DVR recordings (LATM)