fix but failed

src/content/reducers/input.js

@@ -7,13 +7,11 @@ const defaultState = {
 export default function reducer(state = defaultState, action = {}) {
   switch (action.type) {
   case actions.INPUT_KEY_PRESS:
-    return Object.assign({}, state, {
-      keys: state.keys.concat([action.key]),
-    });
+    return { ...state,
+      keys: state.keys.concat([action.key]), };
   case actions.INPUT_CLEAR_KEYS:
-    return Object.assign({}, state, {
-      keys: [],
-    });
+    return { ...state,
+      keys: [], };
   default:
     return state;
   }