Bump cross-env from 4.0.0 to 5.2.0

Bumps [cross-env](https://github.com/kentcdodds/cross-env) from 4.0.0 to 5.2.0.
- [Release notes](https://github.com/kentcdodds/cross-env/releases)
- [Changelog](https://github.com/kentcdodds/cross-env/blob/master/CHANGELOG.md)
- [Commits](https://github.com/kentcdodds/cross-env/compare/v4.0.0...v5.2.0)

package.json

@@ -12,7 +12,7 @@
     "apply-loader": "0.1.0",
     "awesome-typescript-loader": "^5.0.0",
     "core-js": "2.4.1",
-    "cross-env": "4.0.0",
+    "cross-env": "5.2.0",
     "css-loader": "0.28.0",
     "electron": "^5.0.1",
     "electron-builder": "^20.40.2",

yarn.lock

@@ -1470,11 +1470,11 @@ create-hmac@^1.1.0, create-hmac@^1.1.2, create-hmac@^1.1.4:
     safe-buffer "^5.0.1"
     sha.js "^2.4.8"
 
-cross-env@4.0.0:
-  version "4.0.0"
-  resolved "https://registry.yarnpkg.com/cross-env/-/cross-env-4.0.0.tgz#16083862d08275a4628b0b243b121bedaa55dd80"
+cross-env@5.2.0:
+  version "5.2.0"
+  resolved "https://registry.yarnpkg.com/cross-env/-/cross-env-5.2.0.tgz#6ecd4c015d5773e614039ee529076669b9d126f2"
   dependencies:
-    cross-spawn "^5.1.0"
+    cross-spawn "^6.0.5"
     is-windows "^1.0.0"
 
 cross-spawn-promise@^0.10.1: