Install babel-core bridge for jest

Author: Clement Hoang

packages/react-scripts/package.json

@@ -21,11 +21,12 @@
     "react-scripts": "./bin/react-scripts.js"
   },
   "dependencies": {
-    "autoprefixer": "7.1.6",
     "@babel/core": "7.0.0-beta.31",
     "@babel/runtime": "7.0.0-beta.31",
+    "autoprefixer": "7.1.6",
+    "babel-core": "^7.0.0-bridge.0",
     "babel-eslint": "^8.0.2",
-    "babel-jest": "21.2.0",
+    "babel-jest": "21.3.0-beta.9",
     "babel-loader": "^8.0.0-beta.0",
     "babel-preset-react-app": "^3.1.0",
     "case-sensitive-paths-webpack-plugin": "2.1.1",