deepEqual is no longer needed

With this commit:
reduxjs/redux-devtools@e0d1f7f7a638def2c71ea0d
ddd6ff4d45b933702#diff-1c2c1c9f43f83fc48df5e6dee871ed75L12 deep
equality is no longer needed.

Author: chibicode

src/mixins/expanded-state-handler.js

@@ -1,5 +1,3 @@
-import deepEqual from '../utils/deepEqual';
-
 export default {
   handleClick(e) {
     e.stopPropagation();
@@ -13,9 +11,5 @@ export default {
     this.renderedChildren = [];
     this.itemString = false;
     this.needsChildNodes = true;
-  },
-
-  shouldComponentUpdate(nextProps, nextState) {
-    return !deepEqual(this.state, nextState) || !deepEqual(this.props, nextProps);
   }
 };