fix(package): update babel-preset-react-app to version 7.0.2

Closes #52

Author: greenkeeper[bot]

package.json

@@ -10,7 +10,7 @@
     "babel-jest": "23.6.0",
     "babel-loader": "8.0.4",
     "babel-plugin-named-asset-import": "0.2.3",
-    "babel-preset-react-app": "6.1.0",
+    "babel-preset-react-app": "7.0.2",
     "bfj": "6.1.1",
     "case-sensitive-paths-webpack-plugin": "2.1.2",
     "chalk": "2.4.1",