Fix Travis

Author: sindresorhus

package.json

@@ -54,7 +54,7 @@
 		"fixture-stdout": "^0.2.1",
 		"mock-require": "^3.0.3",
 		"strip-ansi": "^6.0.0",
-		"xo": "^0.26.1"
+		"xo": "^0.25.0"
 	},
 	"xo": {
 		"rules": {