The ornamental design for a raingutter, as shown and described.
FIG. 1 is a perspective view of a rain gutter, showing our new design;
FIG. 2 is a rear elevational view thereof;
FIG. 3 is a front elevational view thereof;
FIG. 4 is a top plan view thereof;
FIG. 5 is a bottom plan view thereof; and,
FIG. 6 is a cross-sectional view thereof, taken along lines 6-6 of FIG. 4.
The regular broken lines showing a roof and support board in FIG. 1 depict environmental matter and form no part of the claimed design. The remaining dot-dash broken lines represent a boundary of the design.