chore(package): update eslint-config-xo to version 0.29.0

Closes #2

Author: greenkeeper[bot]

package.json

@@ -28,7 +28,7 @@
     "coveralls": "^3.0.2",
     "eslint": "^6.0.1",
     "eslint-config-prettier": "^6.0.0",
-    "eslint-config-xo": "^0.26.0",
+    "eslint-config-xo": "^0.29.0",
     "eslint-plugin-json": "^1.4.0",
     "eslint-plugin-prettier": "^3.0.0",
     "husky": "^3.0.0",