Update CHANGELOG

fixed a NullReferenceException on TilesetBuilder export

closes #4506

Changes to Tiberium and Viceroids

Tiberium Poisoning caused by walking on Tiberium with infantry is
nerfed.

W/O nerf: 16 seconds to kill Minigunner
W/ nerf: 31 seconds to kill Minigunner

Chance of viceroid spawning has been buffed.

W/O buff: with about 40-50 minigunners, only 1 will viceroid from just
standing on tiberium, other factors not counted.
W/ buff: with about 40-50 minigunners, 3 or more will viceroid from just
standing on tiberium, other factors not counted.

@Infantry and Tanks do more damage to Viceroids, Chem Warriors do less
damage to Viceroids.

W/O buff and nerf: Infantry is complete shit at defeating viceroids, you
need to use vehicles, which you need multiple of. Chem Warriors are
fucking badass at destroying viceroids.
W/ buff and nerf: Infantry and tanks are good for defeating viceroids.
Chem Warriors are shit at it.

Viceroids can no longer gain experience. They still give experience on
death though.

W/O buff/nerf/whateverthisis: Viceroids can gain experience and become
veterans, getting more health and doing more damage. Killing them gives
experience.
W/ buff/nerf/whatever: Viceroids cannot rank up and become veterans
anymore. Killing them gives experience.

emergency hotfix

woopwoop
wrong number

Replaces the infantry weapon changes

replaces with vice nerf

Updated the Changelog with Viceroid changes

emergency hotfix

woopwoop
wrong number

Replaces the infantry weapon changes

replaces with vice nerf

Updated the Changelog with Viceroid changes