typo fix

README.md

@@ -61,7 +61,7 @@ var sortable = new Sortable(el, {
 	animation: 150,  // ms, animation speed moving items when sorting, `0` — without animation
 	handle: ".my-handle",  // Drag handle selector within list items
 	filter: ".ignore-elements",  // Selectors that do not lead to dragging (String or Function)
-	draggable: ".item",  // Specifies which items inside the element should be sortable
+	draggable: ".item",  // Specifies which items inside the element should be draggable
 	ghostClass: "sortable-ghost",  // Class name for the drop placeholder
 	chosenClass: "sortable-chosen",  // Class name for the chosen item
 	dataIdAttr: 'data-id',