Update to xo

.travis.yml

@@ -3,7 +3,7 @@ node_js:
   - 'node'
   - '6'
   - '4'
-script: npm run lint && npm test
+script: npm test
 after_success: npm run coverage
 notifications:
   email:

package.json

@@ -7,15 +7,14 @@
     "node": ">=4"
   },
   "scripts": {
-    "test": "nyc ava test",
-    "lint": "eslint src",
+    "test": "xo && nyc ava",
     "coverage": "nyc report --reporter=text-lcov | coveralls"
   },
-  "eslintConfig": {
-    "extends": "lukechilds",
-    "rules": {
-      "prefer-rest-params": "off"
-    }
+  "xo": {
+    "extends": "xo-lukechilds",
+    "envs": [
+      "browser"
+    ]
   },
   "repository": {
     "type": "git",
@@ -41,8 +40,8 @@
   "devDependencies": {
     "ava": "^0.20.0",
     "coveralls": "^2.11.13",
-    "eslint": "^4.1.0",
-    "eslint-config-lukechilds": "^1.9.0",
-    "nyc": "^11.0.1"
+    "eslint-config-xo-lukechilds": "^1.0.0",
+    "nyc": "^11.0.2",
+    "xo": "^0.18.2"
   }
 }