Add Nyc

Author: Arttse

package.json

@@ -6,7 +6,7 @@
   "scripts": {
     "lint": "eslint .",
     "lint:fix": "npm run lint -- --fix",
-    "test": "npm run lint && ava"
+    "test": "npm run lint && nyc -c ava"
   },
   "engines": {
     "node": ">=0.10"
@@ -41,6 +41,7 @@
     "eslint-plugin-import": "^2.16.0",
     "eslint-plugin-node": "^8.0.1",
     "eslint-plugin-promise": "^4.0.1",
-    "eslint-plugin-standard": "^4.0.0"
+    "eslint-plugin-standard": "^4.0.0",
+    "nyc": "^13.3.0"
   }
 }