chore(release): 2.4.0 [skip ci]

# [2.4.0](v2.3.1...v2.4.0) (2018-06-27)

### Features

* remove deprecated lifecycle hooks and polyfill for older react versions ([c1ab1cf](c1ab1cf))

### Performance Improvements

* don't reflow when there's no class to add ([d7b898d](d7b898d))

Author: semantic-release-bot

CHANGELOG.md

@@ -1,3 +1,15 @@
+# [2.4.0](https://github.com/reactjs/react-transition-group/compare/v2.3.1...v2.4.0) (2018-06-27)
+
+
+### Features
+
+* remove deprecated lifecycle hooks and polyfill for older react versions ([c1ab1cf](https://github.com/reactjs/react-transition-group/commit/c1ab1cf))
+
+
+### Performance Improvements
+
+* don't reflow when there's no class to add ([d7b898d](https://github.com/reactjs/react-transition-group/commit/d7b898d))
+
 <a name="2.3.1"></a>
 ## [2.3.1](https://github.com/reactjs/react-transition-group/compare/v2.3.0...v2.3.1) (2018-04-14)
 

package.json

@@ -1,6 +1,6 @@
 {
   "name": "react-transition-group",
-  "version": "2.3.1",
+  "version": "2.4.0",
   "description": "A react component toolset for managing animations",
   "main": "lib/index.js",
   "scripts": {