Fix not properly unbound event-listener in _onTapStop

Add info about initialization to README

README.md

@@ -184,6 +184,8 @@ selection.on('beforestart', evt => {
 });
 ```
 
+> The initialization is **always** synchronous, therefore there is no `init` event and any initilization-related work can be done immediately after creation.
+
 ### Event data
 Each `evt` object will yield the following data:
 

src/index.ts

@@ -475,7 +475,7 @@ export default class SelectionArea extends EventTarget {
         this._scrollSpeed = {x: 0, y: 0};
 
         // Unbind mouse scrolling listener
-        off(window, 'wheel', this._manualScroll);
+        off(document, 'wheel', this._manualScroll, {passive: true});
 
         // Remove selection-area from dom
         this._clippingElement.remove();