chore(package): update ava to version 0.19.1

https://greenkeeper.io/

Author: greenkeeper[bot]

package.json

@@ -31,7 +31,7 @@
     "@aureooms/js-itertools": "^3.1.1",
     "@aureooms/js-random": "^2.0.0",
     "@aureooms/js-search": "^0.0.4",
-    "ava": "^0.19.0",
+    "ava": "^0.19.1",
     "babel-cli": "^6.23.0",
     "babel-polyfill": "^6.23.0",
     "babel-preset-latest": "^6.22.0",