Fix onKeyDown event handler

Author: gnapse

src/Node.js

@@ -35,7 +35,7 @@ const Node = props => {
             onToggleExpand(node);
           },
           onKeyDown(event) {
-            if (event.charCode === 32 || event.charCode === 13) {
+            if (event.keyCode === 32 || event.keyCode === 13) {
               event.preventDefault();
               event.stopPropagation();
               onToggleExpand(node);

tests/Treefold.test.js

@@ -106,8 +106,8 @@ describe('Treefold', () => {
       });
 
       it('allows to expand and collapse nodes using the keyboard', () => {
-        testWithEvent(item => item.simulate('keydown', { charCode: 13 }));
-        testWithEvent(item => item.simulate('keydown', { charCode: 32 }));
+        testWithEvent(item => item.simulate('keydown', { keyCode: 13 }));
+        testWithEvent(item => item.simulate('keydown', { keyCode: 32 }));
       });
     };