fix react-bootstrap-table#1260

Author: AllenFang

packages/react-bootstrap-table2/package.json

@@ -37,7 +37,7 @@
   ],
   "dependencies": {
     "classnames": "^2.2.5",
-    "react-transition-group": "2.5.3",
+    "react-transition-group": "^4.2.0",
     "underscore": "1.9.1"
   },
   "peerDependencies": {