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

Closes #309

Author: greenkeeper[bot]

package.json

@@ -90,7 +90,7 @@
     "colors": "^1.3.2",
     "commitizen": "^3.0.0",
     "coveralls": "^3.0.2",
-    "cross-env": "^5.2.0",
+    "cross-env": "^7.0.2",
     "cz-conventional-changelog": "^2.1.0",
     "husky": "^1.0.1",
     "jest": "^23.6.0",