src/main/java/com/github/ricksbrown/cowsay/CowFace.java
protected static CowFace getByMode(final String mode) {
		if (mode != null) {
			return COW_MODES.get(mode);
		}
		return null;
	}
protected static CowFace getByMode(final String mode) {
		if (mode != null) {
			return COW_MODES.get(mode);
		}
		return null;
	}
Get cow args by mode.
@param mode A mode key, "b" for Borg, "d" for dead, "g" for greedy etc
@return The CowArgs for the given mode or null if not found