HexbinHoverHandler typing incorrect

[timnyborg]

While the HexbinHoverHandler mouseout and mouseover functions were updated in 6.0.1 to support events (b1f29b8), the typescript definitions were not:

leaflet-d3/index.d.ts

Lines 93 to 96 in 147ca3e

	interface HexbinHoverHandler {
	mouseover(hexLayer: HexbinLayer, data: any): void;
	mouseout(hexLayer: HexbinLayer, data: any): void;
	}

This causes typescript compilation errors: Type '(hexLayer: HexbinLayer, event: MouseEvent, data: any) => void' is not assignable to type '(hexLayer: HexbinLayer, data: any) => void'.