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Green is used for pure buffs. Examples of buffs are increase in stats, decrease in cooldowns, decrease in manacost etc.
Red is used for pure nerfs, i.e. the exact opposite of buffs.
Yellow is used for a change that is neither a pure buff or a pure nerf.
Blue is used for small, barely noticeable changes, or bug fixes.
The decision to take in a list of bugs was questionable, but as some of these bugs were game-changing we decided to nevertheless include them all.
Some changes might lean heavily to either a buff or a nerf, but is still considered yellow, as it is not purely a buff or nerf.