feat(Deps): Upgrade postcss to 7.0.39

Author: htbkoo

package-lock.json

@@ -30,7 +30,7 @@
   "dependencies": {
     "autoprefixer": "^8.4.1",
     "css": "^2.2.1",
-    "postcss": "^7.0.36",
+    "postcss": "^7.0.39",
     "postcss-js": "^1.0.1",
     "react": "^16.3.2",
     "react-dom": "^16.3.2",