update read-pkg-up

Author: koddsson

package.json

@@ -49,7 +49,7 @@
     "eslint-rule-documentation": ">=1.0.0",
     "inquirer": "^6.0.0",
     "prettier": ">=1.12.0",
-    "read-pkg-up": "^4.0.0",
+    "read-pkg-up": "^6.0.0",
     "svg-element-attributes": "^1.2.1"
   },
   "peerDependencies": {