Moves react-transition-group to core dependencies

Author: bkrem

package-lock.json

@@ -42,6 +42,7 @@
   "dependencies": {
     "clone": "^2.1.1",
     "d3": "3.5.17",
+    "react-transition-group": "^1.1.3",
     "uuid": "^3.0.1"
   },
   "devDependencies": {
@@ -69,7 +70,6 @@
     "react": "15.4.2",
     "react-addons-test-utils": "15.4.2",
     "react-dom": "15.4.2",
-    "react-transition-group": "^1.1.3",
     "regenerator-runtime": "^0.10.5",
     "rimraf": "^2.6.1",
     "style-loader": "^0.17.0",