Update dev-dependencies

Author: wooorm

package.json

@@ -26,19 +26,19 @@
     "vfile-find-up": "^2.0.0"
   },
   "devDependencies": {
-    "execa": "^0.6.0",
+    "execa": "^0.7.0",
     "has": "^1.0.1",
     "nlcst-to-string": "^2.0.0",
-    "nyc": "^10.1.0",
+    "nyc": "^11.1.0",
     "remark-cli": "^3.0.0",
-    "remark-preset-wooorm": "^2.0.0",
+    "remark-preset-wooorm": "^3.0.0",
     "retext": "^5.0.0",
     "rimraf": "^2.5.4",
     "tape": "^4.0.0",
     "to-vfile": "^2.0.0",
     "trough": "^1.0.0",
     "unist-util-visit": "^1.1.0",
-    "xo": "^0.17.1"
+    "xo": "^0.18.0"
   },
   "scripts": {
     "build-md": "remark . -qfo",
@@ -55,9 +55,12 @@
     "branches": 100
   },
   "xo": {
-    "space": true
+    "space": true,
+    "esnext": false
   },
   "remarkConfig": {
-    "plugins": ["preset-wooorm"]
+    "plugins": [
+      "preset-wooorm"
+    ]
   }
 }