chore(package): update cross-env to version 7.0.2

Closes #112

Author: greenkeeper[bot]

package.json

@@ -43,7 +43,7 @@
     "@types/webpack-env": "^1.13.9",
     "babel-core": "^7.0.0-bridge.0",
     "babel-loader": "^8.0.5",
-    "cross-env": "^5.2.0",
+    "cross-env": "^7.0.2",
     "css-loader": "^2.1.1",
     "enzyme": "^3.9.0",
     "enzyme-adapter-react-16": "^1.12.1",