chore(package): update ava to version 0.17.0 (#14)

Author: greenkeeperio-bot

package.json

@@ -8,7 +8,7 @@
   },
   "bugs": "https://github.com/static-dev/source-loader/issues",
   "devDependencies": {
-    "ava": "^0.16.0",
+    "ava": "^0.17.0",
     "coveralls": "2.x",
     "nyc": "9.0.1",
     "standard": "8.4.0",