Update dependency ava to v1.4.1 (#159)

Author: renovate-bot

package.json

@@ -38,7 +38,7 @@
     "@types/acorn": "4.0.5",
     "@types/estree": "0.0.39",
     "@types/temp-write": "3.3.0",
-    "ava": "1.2.1",
+    "ava": "1.4.1",
     "builtins": "2.0.0",
     "husky": "1.3.1",
     "lint-staged": "8.1.4",