chore(package): update xo to version 0.25.0

Author: greenkeeper[bot]

package.json

@@ -25,7 +25,7 @@
     "semantic-release": "^15.0.0",
     "sinon": "^7.1.1",
     "stream-buffers": "^3.0.2",
-    "xo": "^0.24.0"
+    "xo": "^0.25.0"
   },
   "engines": {
     "node": ">=8.3"