use nyc master

Author: jamestalmage

package.json

@@ -121,7 +121,7 @@
   "devDependencies": {
     "coveralls": "^2.11.4",
     "hook-std": "^0.1.0",
-    "nyc": "^5.0.1",
+    "nyc": "github:bcoe/nyc",
     "promise-delegates": "^0.1.0",
     "signal-exit": "^2.1.2",
     "sinon": "^1.17.2",