Updated CHANGELOG.txt for 5.4.2.

CHANGELOG.txt

@@ -1,8 +1,12 @@
 5.4.2:
+- Fixed //gen not having a proper minimum parameter count of 2.
+- Added //re and //rep as aliases for //replace, and aliases /asc(end),
+    /desc(end), and /j(umpto).
 - Fixed schematics not properly loading chests with the new code, meaning that
     enchantments and other properties were not always properly loaded.
 - Fixed -1 not being a valid data value in Block, which broke //replace.
 - Fixed snapshots to support custom blocks/tile entity data.
+- Updated bundled README.html to be current.
 
 5.4.1:
 - Fixed lingering 256 block ID restriction preventing block IDs up to 4095.