chore(deps): update cross-env to 5.1.5 (#147)

Author: Kocal

template/package.json

@@ -55,7 +55,7 @@
     "@babel/plugin-proposal-optional-chaining": "^7.0.0-beta.39",
     "babel-loader": "8.0.0-beta.2",
     "copy-webpack-plugin": "^4.0.1",
-    "cross-env": "^5.0.5",
+    "cross-env": "^5.1.5",
     "css-loader": "^0.28.11",
     "file-loader": "^1.1.11",
     "mini-css-extract-plugin": "^0.4.0",