The ornamental design for sprayer, as shown and described.
FIG. 1 is a perspective view of a new and ornamental design for a sprayer, the wand portion being shown in phantom for environmental purposes only and forming no part of the claimed design;
FIG. 2 is a front elevation view thereof;
FIG. 3 is a rear elevation view thereof;
FIG. 4 is a first side elevation view thereof;
FIG. 5 is second side elevation view thereof;
FIG. 6 is a top plan view thereof; and,
FIG. 7 is a bottom plan view thereof.
The broken line showing of the measurement indications in FIGS. 1-4 and 6 is included for the purpose of illustrating and forms no part of the claimed design.