Update release handling document
Update release handling document

Add section on NEWS / Changelog handling.

Part of #160

SoundGoof/NIPAP,plajjan/NIPAP,SpriteLink/NIPAP,bbaja42/NIPAP,ettrig/NIPAP,ettrig/NIPAP,fredsod/NIPAP,plajjan/NIPAP,bbaja42/NIPAP,garberg/NIPAP,fredsod/NIPAP,plajjan/NIPAP,SpriteLink/NIPAP,bbaja42/NIPAP,ettrig/NIPAP,SoundGoof/NIPAP,ettrig/NIPAP,garberg/NIPAP,garberg/NIPAP,ettrig/NIPAP,bbaja42/NIPAP,fredsod/NIPAP,garberg/NIPAP,SoundGoof/NIPAP,fredsod/NIPAP,ettrig/NIPAP,plajjan/NIPAP,SoundGoof/NIPAP,plajjan/NIPAP,SoundGoof/NIPAP,SpriteLink/NIPAP,SpriteLink/NIPAP,SpriteLink/NIPAP,fredsod/NIPAP,SoundGoof/NIPAP,garberg/NIPAP,garberg/NIPAP,bbaja42/NIPAP,fredsod/NIPAP,plajjan/NIPAP,bbaja42/NIPAP,SpriteLink/NIPAP