chore(package): update ava to version 0.18.2

https://greenkeeper.io/

Author: greenkeeper[bot]

package.json

@@ -28,7 +28,7 @@
     "@aureooms/js-functools": "^2.0.3",
     "@aureooms/js-heap-spec": "^10.0.1",
     "@aureooms/js-itertools": "^3.1.1",
-    "ava": "^0.17.0",
+    "ava": "^0.18.2",
     "babel-cli": "^6.18.0",
     "babel-polyfill": "^6.20.0",
     "babel-preset-latest": "^6.16.0",