fix: missing return types

Author: tsvetomir

src/main.d.ts

@@ -1,12 +1,12 @@
 interface DraggableOptions {
-    press?: Function,
-    drag?: Function,
-    release?: Function,
-    mouseOnly?: boolean
+    press?: Function;
+    drag?: Function;
+    release?: Function;
+    mouseOnly?: boolean;
 }
 
 export default class Draggable {
-    constructor(options?: DraggableOptions)
-    bindTo(element: Element)
-    destroy()
+    constructor(options?: DraggableOptions);
+    bindTo(element: Element): void;
+    destroy(): void;
 }