chore(update ava):

Author: posva

package-lock.json

@@ -11,8 +11,7 @@
   "scripts": {
     "lint": "eslint --ext=js,html src tests examples",
     "test": "npm run lint",
-    "coverage": "cross-env NODE_ENV=test nyc mocha test/index.js",
-    "unit": "cross-env NODE_ENV=test nyc ava test/*.js",
+    "unit": "nyc ava test/*.js",
     "dev": "npm run unit -- -w",
     "prepublishOnly": "npm run build"
   },
@@ -39,7 +38,7 @@
     "firebase": "^4.5.0"
   },
   "devDependencies": {
-    "ava": "^0.22.0",
+    "ava": "^0.23.0",
     "babel-plugin-istanbul": "^4.1.5",
     "babel-preset-env": "^1.6.0",
     "babel-register": "^6.26.0",