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

Closes #20

Author: greenkeeper[bot]

package.json

@@ -44,7 +44,7 @@
     "codecov": "^3.0.2",
     "compodoc": "0.0.41",
     "core-js": "^2.5.6",
-    "cross-env": "^5.1.5",
+    "cross-env": "^7.0.2",
     "inversify": "^4.13.0",
     "npm-run-all": "^4.1.3",
     "nyc": "^12.0.1",