chore(package): update ava to version 1.2.0

Closes #58

Author: greenkeeper[bot]

package.json

@@ -49,7 +49,7 @@
     "@types/gulp": "^4.0.4",
     "@types/gulp-util": "^3.0.31",
     "@types/through2": "^2.0.33",
-    "ava": "^0.25.0",
+    "ava": "^1.2.0",
     "conventional-changelog-lint": "^2.0.0",
     "coveralls": "^3.0.0",
     "cz-customizable": "^5.0.0",