The ornamental design for a sprayer, as shown and described.
FIG. 1 is a front, right side, and top perspective view of a sprayer that has the design.
FIG. 2 is a front, left side, and bottom perspective view of the sprayer.
FIG. 3 is a front elevation of the sprayer.
FIG. 4 is a left side elevation of the sprayer.
FIG. 5 is a back elevation of the sprayer.
FIG. 6 is a top plan view of the sprayer; and,
FIG. 7 is a bottom plan view of the sprayer.
The broken line showing of parts of the sprayer is to illustrate possible configurations of unclaimed parts of the sprayer, and forms no part of the claimed design.