Update dev-dependencies

Author: wooorm

package.json

@@ -24,12 +24,12 @@
   "devDependencies": {
     "browserify": "^14.1.0",
     "esmangle": "^1.0.1",
-    "nyc": "^10.0.0",
+    "nyc": "^11.0.0",
     "remark": "^7.0.0",
     "remark-cli": "^3.0.0",
-    "remark-preset-wooorm": "^2.0.0",
+    "remark-preset-wooorm": "^3.0.0",
     "tape": "^4.0.0",
-    "xo": "^0.17.1"
+    "xo": "^0.18.0"
   },
   "scripts": {
     "build-md": "remark . -qfo",
@@ -49,11 +49,14 @@
   },
   "xo": {
     "space": true,
+    "esnext": false,
     "ignores": [
       "unist-util-source.js"
     ]
   },
   "remarkConfig": {
-    "plugins": ["preset-wooorm"]
+    "plugins": [
+      "preset-wooorm"
+    ]
   }
 }