chore(package): update ava to version 1.2.0

Closes #36

Author: greenkeeper[bot]

package.json

@@ -12,7 +12,7 @@
     "with": "^6.0.0"
   },
   "devDependencies": {
-    "ava": "^0.25.0",
+    "ava": "^1.2.0",
     "coveralls": "^3.0.2",
     "nyc": "^12.0.2",
     "reshape": "^1.0.0",