Update dev-dependencies

package.json

@@ -10,25 +10,25 @@
  "babelify": "^8.0.0",
  "bail": "^1.0.0",
  "browser-pack-flat": "^3.0.5",
- "browserify": "^15.0.0",
+ "browserify": "^16.0.0",
  "bundle-collapser": "^1.3.0",
  "chalk": "^2.0.0",
- "common-shakeify": "^0.4.5",
+ "common-shakeify": "^0.5.0",
  "escodegen": "^1.7.0",
  "esmangle": "^1.0.1",
  "esprima": "^4.0.0",
- "execa": "^0.9.0",
+ "execa": "^0.10.0",
  "hast-util-assert": "^1.0.0",
  "lerna": "^2.0.0",
  "mdast-zone": "^3.0.1",
- "nyc": "^11.0.0",
+ "nyc": "^12.0.0",
  "remark-cli": "^5.0.0",
  "remark-preset-wooorm": "^4.0.0",
  "tape": "^4.5.1",
  "to-vfile": "^4.0.0",
  "unist-builder": "^1.0.2",
  "unist-util-remove-position": "^1.0.0",
- "xo": "^0.18.0"
+ "xo": "^0.21.0"
  },
  "scripts": {
  "postinstall": "lerna bootstrap",