Update nyc

Closes GH-2.

Author: greenkeeperio-bot

package.json

@@ -32,7 +32,7 @@
  "devDependencies": {
  "browserify": "^13.0.0",
  "esmangle": "^1.0.0",
- "nyc": "^8.1.0",
+ "nyc": "^9.0.1",
  "remark-cli": "^2.0.0",
  "remark-preset-wooorm": "^1.0.0",
  "tape": "^4.0.0",