Update dependency ava to v0.25.0

Author: renovate-bot

package.json

@@ -29,7 +29,7 @@
     "@aureooms/js-compare": "1.4.5",
     "@aureooms/js-itertools": "3.4.0",
     "@aureooms/js-random": "2.0.0",
-    "ava": "0.20.0",
+    "ava": "0.25.0",
     "babel-cli": "6.26.0",
     "babel-polyfill": "6.26.0",
     "babel-preset-latest": "6.24.1",