Update dev-dependencies

Author: wooorm

package.json

@@ -37,15 +37,15 @@
     "index.js"
   ],
   "devDependencies": {
-    "browserify": "^14.0.1",
+    "browserify": "^16.0.0",
     "esmangle": "^1.0.1",
     "hastscript": "^3.0.1",
-    "nyc": "^11.0.0",
-    "remark-cli": "^4.0.0",
-    "remark-preset-wooorm": "^3.0.0",
+    "nyc": "^12.0.0",
+    "remark-cli": "^5.0.0",
+    "remark-preset-wooorm": "^4.0.0",
     "tape": "^4.0.0",
     "unist-builder": "^1.0.2",
-    "xo": "^0.18.1"
+    "xo": "^0.21.0"
   },
   "scripts": {
     "build-md": "remark . -qfo",