chore(package): update xo to version 0.21.1

greenkeeper[bot] · greenkeeper[bot] · commit a66e7ca9a52e · 2018-05-19T09:17:36.000Z
Closes #14
diff --git a/package.json b/package.json
@@ -46,6 +46,6 @@
     "eslint-config-xo-lukechilds": "^1.0.0",
     "nyc": "^11.0.3",
     "this": "^1.0.2",
-    "xo": "^0.20.1"
+    "xo": "^0.21.1"
   }
 }
