Add additional change vertical gesture test

Author: MaxGraey

index.js

@@ -295,7 +295,7 @@ export default class Drawer extends Component {
     let inMask = this.testPanResponderMask(e, gestureState)
     if (!inMask) return false
     // skip gesture process if we have mostly vertical swipe
-    if (Math.abs(gestureState.dy) >= Math.abs(gestureState.dx)) return false
+    if (!this._open && Math.abs(gestureState.dy) >= Math.abs(gestureState.dx)) return false
     this._panStartTime = Date.now()
     if (inMask && this.shouldCaptureGestures()) return true
     if (this.props.negotiatePan) return false