Added rocket-propelled elytra flight
Added Iron Nuggets
Added Sweeping Edge enchantment for swords
Changed the attack indicator to hint when you should attack
[Bug MC-85162] - Slight player/mob offset when on Farmland Block
[Bug MC-99914] - DataWatcher / EntityMetadata ID is based on the class load order
[Bug MC-100333] - Entities from old (<= 1.5.2) worlds are killed when loaded in current versions due to a typo in the health data fixer
[Bug MC-102072] - Structure Block: Unable to navigate in the “structure name” field of structure blocks, using the arrow-keys, pos1, end or the delete key
[Bug MC-102867] - chat key bound to unicode char causes crash in creative inventory
[Bug MC-103177] - Missing subtitles for polar bears, strays, husks, and wither skeletons
[Bug MC-103497] - End Dragon Does not respawn
Remove incorrect snapshot version warning.
MC-101360 – off hand full inventory bug
MC-101425 – Skeletons do not burn up the iron trapdoors
New command: /stopsound
/tp will no longer teleport the player to a y-coordinate outside the range -512 to 512.
Better memory use of pathfinding and biome caching.
The blocklist consists of servers in violation of the Minecraft EULA (End User License Agreement).
This affects all versions that depend on the Netty library, back to version 1.7.2.
As of the release of this version, the Netty networking library that Minecraft uses now checks https://sessionserver.mojang.com/blockedservers  when connecting to a multiplayer server, and if the server is on the blocked server list, reports to the user that the server is unavailable.
Realms and AI tweaks.
MC-212 – Faulty fall damage when logging out and logging back in while falling
MC-17630 – Zombie pathfinding to unreachable targets causes server lag
MC-82464 – Colored 'dead' skin template parts cause in-game issues
MC-87907 – Endermen don't become aggressive when players look at their head/feet.
MC-88357 – Crash when going outside height limit or into the void with F3
MC-89760 – Skin's jacket parts do not show up under specific conditions
MC-89848 – playsound/sound engine pitch algorithm isn't working properly
MC-94438 – Server: Mob pathfinding induced massive lag in any versions 15w49a and later
MC-96526 – Crash caused by StackOverflowError when trading too many items at once
MC-98994 – Chunk generation performance regressed by 20–30%
MC-100692 – Collisions cause extreme lag
MC-100382 – Pathfinding Memory Leak
MC-100410 – Corrupting world by teleporting to y=(-)Infinity
MC-100442 – DEV - Navigation Listener very slow code
Fixed the issue that some players could not connect to some servers or their realms.