chore(deps): remove cross-env dep

Author: posva

package-lock.json

@@ -47,7 +47,6 @@
     "babel-plugin-istanbul": "^4.1.5",
     "babel-preset-env": "^1.6.1",
     "babel-register": "^6.26.0",
-    "cross-env": "^5.1.3",
     "cz-conventional-changelog": "^2.1.0",
     "eslint": "^4.14.0",
     "eslint-plugin-html": "^4.0.1",