The ornamental design for a humidor, as shown and described.
FIG. 1 is a perspective view of a humidor showing the design;
FIG. 2 is a top plan view of the humidor of FIG. 1;
FIG. 3 is a bottom plan view of the humidor of FIG. 1;
FIG. 4 is a front elevational view of the humidor of FIG. 1;
FIG. 5 is a rear elevational view of the humidor of FIG. 1;
FIG. 6 is a left elevational view of the humidor of FIG. 1; and,
FIG. 7 is a right elevational view of the humidor of FIG. 1.
The dash-dash broken lines in the drawings depict portions of the humidor that form no part of the claimed design. The long dash-dot broken lines in the drawings define the boundaries of the claim and form no part thereof.