Humidifier

FIG. 1 is a perspective view of a humidifier showing the new design;

FIG. 2 is a perspective view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a back view thereof;

FIG. 5 is a left-side view thereof;

FIG. 6 is a right-side view thereof;

FIG. 7 is a top view thereof; and,

FIG. 8 is a bottom view thereof.

The broken lines depict portions of the article that form no part of the claimed design.