chore(package): update cross-env to version 5.1.0 (#4261)

Author: greenkeeper[bot]

package.json

@@ -55,7 +55,7 @@
     "babel-preset-stage-3": "6.24.1",
     "babel-register": "6.26.0",
     "bcrypt-nodejs": "0.0.3",
-    "cross-env": "5.0.2",
+    "cross-env": "5.1.0",
     "deep-diff": "0.3.8",
     "eslint": "^4.7.1",
     "eslint-plugin-flowtype": "^2.25.0",