The ornamental design for an electronickeyboard, as shown and described.
FIG. 1 is a front and top perspective view of an electronic keyboard, showing our new design;
FIG. 2 is a front elevational view thereof;
FIG. 3 is a rear elevational view thereof;
FIG. 4 is a left side elevational view thereof;
FIG. 5 is a right side elevational view thereof;
FIG. 6 is a top plan view thereof;
FIG. 7 is a bottom plan view thereof; and,
FIG. 8 is an enlarged view of the portion taken at line-8 in FIG. 1.
The dashed broken lines in the figures illustrate portions of the article that form no part of the claimed design. The dash dot dash lines in FIGS. 1 and 8 are for the purpose of depicting the cut line of the enlarged view and form no part of the claim.