Update dev-dependencies

Author: wooorm

package.json

@@ -32,18 +32,18 @@
   },
   "devDependencies": {
     "browserify": "^16.0.0",
-    "is-hidden": "^1.1.0",
+    "is-hidden": "^1.0.0",
     "negate": "^1.0.0",
-    "nyc": "^14.0.0",
+    "nyc": "^15.0.0",
     "prettier": "^1.0.0",
-    "remark-cli": "^6.0.0",
-    "remark-preset-wooorm": "^5.0.0",
+    "remark-cli": "^7.0.0",
+    "remark-preset-wooorm": "^6.0.0",
     "retext-english": "^3.0.0",
     "retext-stringify": "^2.0.0",
     "tape": "^4.0.0",
-    "tinyify": "^2.5.0",
-    "unified": "^7.0.0",
-    "xo": "^0.24.0"
+    "tinyify": "^2.0.0",
+    "unified": "^8.0.0",
+    "xo": "^0.26.0"
   },
   "scripts": {
     "format": "remark . -qfo && prettier --write \"**/*.js\" && xo --fix",
@@ -72,6 +72,7 @@
     "prettier": true,
     "esnext": false,
     "rules": {
+      "unicorn/prefer-includes": "off",
       "guard-for-in": "off"
     },
     "ignore": [