chore(package): update xo to version 0.30.0

Closes #74

Author: greenkeeper[bot]

package.json

@@ -35,7 +35,7 @@
   },
   "devDependencies": {
     "mocha": "^7.0.1",
-    "xo": "^0.25.3",
+    "xo": "^0.30.0",
     "yeoman-assert": "^3.1.1",
     "yeoman-test": "^2.0.0"
   },