chore(package): update eslint-config-xo to version 0.25.0

Closes #10

Author: greenkeeper[bot]

package.json

@@ -16,7 +16,7 @@
   "devDependencies": {
     "eslint": "^4.1.0",
     "eslint-config-prettier": "^2.4.0",
-    "eslint-config-xo": "^0.19.0",
+    "eslint-config-xo": "^0.25.0",
     "eslint-plugin-prettier": "^2.2.0",
     "husky": "^0.14.3",
     "jest": "^22.0.4",