Revert "Update package.json"

This reverts commit 9088a86.

Author: juliovedovatto

package.json

@@ -13,7 +13,6 @@
     "type": "git",
     "url": "https://github.com/MadLittleMods/postcss-css-variables.git"
   },
-  "preinstall": "npm install escape-string-regexp extend match-recursive postcss",
   "dependencies": {
     "balanced-match": "^1.0.0",
     "escape-string-regexp": "^1.0.3",