Update nyc

Closes GH-2.

Author: wooorm

package.json

@@ -25,7 +25,7 @@
     "browserify": "^13.0.0",
     "chalk": "^1.0.0",
     "esmangle": "^1.0.1",
-    "nyc": "^9.0.1",
+    "nyc": "^10.0.0",
     "remark-cli": "^2.0.0",
     "remark-preset-wooorm": "^1.0.0",
     "retext": "^4.0.0",