You can now enchant Multishot up to level 255!
Additionally, some tweaks have been made to the enchantment, such as adjusting the projectile spread to make it more satisfying.
The maximum level in the enchanting table is 35 because it becomes too expensive beyond that point. The same applies to the anvil, but you can enchant it up to level 40 if you somehow obtain a level 40 Enchanted Book.
Note: High levels may cause significant lag!