Pokemon Emerald: Update changelog (#4747)

worlds/pokemon_emerald/CHANGELOG.md

@@ -5,6 +5,10 @@
 - New option `free_fly_blacklist` limits which cities can show up as a free fly location.
 - Spoiler log and hint text for maps where a species can be found now use human-friendly labels.
 - Added many item and location groups based on item type, location type, and location geography.
+- Dexsanity locations for species which evolve via item use (Fire Stone, Metal Coat, etc.) now contribute those items to
+the randomized item pool instead of Great Balls.
+- Rock smash encounters are now randomized according to your wild pokemon randomization option. These encounters are
+_not_ used for logical access (the seed will never require you to catch something through one of these encounters).
 
 ### Fixes